Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf5fa41f25d3823…

MALICIOUS

PDF

87.0 KB Created: 2021-08-05 14:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e78a44800f05cfef116e9ac95ba5831c SHA-1: c9164e800ea13b3fef97dea79c037747443869ad SHA-256: 5bf5fa41f25d3823c778729ec044511c43a4b45356b632a3955eb507c1ffd72a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites acting as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which in turn may host further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=solve+standard+deviation+example+questions PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/61768765d3d4e7f19887505f27e21886/mivuxak.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/25267083789.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160caaa37a21b8---kazevilik.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/23822136768.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/daperupuzujonaban.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609295be73f06---99309333284.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/t6njnteu5hi2kgaqbqb1tv73e3/temomejoxitupopazoxaxe.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/086f3311c66dd2dc2043bdab7b50ff84/49575187708.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///fagava.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/3694beefe3fb2919d7624742b2593ad0/wijerolodenule.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cdc1d3347---dokig.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9ca98ae7e---29560116960.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/485ae4e06df71a7a9999ea36ea1c11a3/pemag.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/64cca1958382fdbb39e65483fbc1fe46/fepasejoge.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/puronigovakupi.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2f1e855d30b6b71b96e6d60c693b8859/33104964841.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/233c651a93ec9656145bf04769c53d20/66366032534.pdfIn PDF document text
    • http://midel.me/userfiles/file/kezotolijekaxikako.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/murejalu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4ae1512adf2d19ebb59cf866a7164c87/91290131380.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52451279b4---xomapomejapeduka.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/makuxopamaremer.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0fe3165d---gixigowif.pdfIn PDF document text
    • http://myredm.ru/uploads/file/15043995824.pdfIn PDF document text
    • 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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 18392 bytes
SHA-256: 761000e2506da4d9ad1ad4bd99c3de3496e432e599496a1e00dc84351c496939
font_02_sfnt_off00013472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 11040 bytes
SHA-256: c123c3d5d309b5c39ce3e89213dde1c93c2738e4ec2e43572fb5a39fa3e6b568

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