Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6a51bed957d3ac…

MALICIOUS

PDF

96.5 KB Created: 2021-07-21 08:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 25b7edde53c95390e523bc1caad7e57d SHA-1: 03d3630e9ad10aeb74078eb8673d33e916ce3ee0 SHA-256: fc6a51bed957d3ac3a7ac28e1ea640a435b56b14655abd5df6c7c70f9587cc53
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and external links, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest it is a phishing or trojan delivery mechanism. The document impersonates Walmart, attempting to lure users into clicking a link that likely leads to credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=down+in+the+deep+where+the+sirens+sing.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://robwalker.net/fckupload/file/bobujutixano.pdf In PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/zosumezikosoxapimane.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/nejumigiwujig.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/85411192896.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/4237770350.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051705354773499.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o8ltotdh7o5e60p2dr1ev4v1r3/duxewuvipomuketanigunif.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d956fc23dd2---9431255497.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/tetiwinejibuzeladuf.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/dufabepogaxawoluzumax.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1db3ed7909789227e0d930ad9b779301/95481953934.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e16ae8efc5---godebofojorixugejajefe.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5ec602d6323dd469049909797505b8f3/81838198143.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/faniruvowi.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b3552be9a1a3d4ddb40e02e34e8c9586/nokaretapuzifefajadadu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/37771567754.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8bb3ef795d9c936c33c4ab4f56f2a032/95564553975.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/jagezirowinetidifefob.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mbo0pdjffqt43jkonl5eeqg4mf/xamuravamumorosip.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae86f1f86---bipugonovuvoxadiwuzim.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c53dee5960a---91051622867.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/81799961322.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/deb0b959ae1d492d7e11069ecadb0c77/14370341618.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vtr5jmk3c06up553ql9duoivk3/mekididolasudag.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/68621950829.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v3jav35cc5t8kelpc6lv1ecp1r/9131556416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=down+in+the+deep+where+the+sirens+singPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 17840 bytes
SHA-256: 214cd2d6e52a61402496b0d001201b691957db1607ab7c0282740a6107fc2a09
font_02_sfnt_off00015b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B15 10548 bytes
SHA-256: ec34b619f57caecec9015a883edaa08d657dfbba8cad21c97592a0f4ec05711e

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