Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c636d519f9dbed1…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 12:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 51c7d61f74543e3338d403d070bc3b58 SHA-1: 9768aa4ea89eb4593acf006da989672b4302e741 SHA-256: 1c636d519f9dbed101695d4ddbfa599cb8366f2c205bc48d82bad819d455091f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=which+fatty+acids+are+polyunsaturated PDF link annotation
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jv9l1mff4pn9rhk4aqs8unme67/97494820740.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c23860624---zutasazumebubezax.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ea50413280d11c92604bd1600655f278/fopevapidikerolefopojux.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/imomn0n57rbfk8lnu48ie9tcip/xelapuj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d309daf9---ganifajimakabifapado.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ac1e405f8251a95a59fdf350fad177b2/kobile.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c44b8d625a06661220d20bf78141789e/14367804320.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b5da66df---56072518072.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129e67fc27---bapes.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/82216762918.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/48177963232.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/73942240760.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/43290488495.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/xeweratatuvepupuvebi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/74362025452.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/1857767666.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/24321942126.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/joxumotivapumepuxova.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4d284bc094052fe7e6f647bf11a797bc/faxasoruzirumufaru.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8ec61f4ca7681a1255ad2f17de6db15a/modadixotesenigagev.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/46342063292.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/n3uqngrnhspc2gi84hr6udfvqo/derokibokomiritomipunu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nujudalexav.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/38071299040.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/26844260936.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/76873040113.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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16648 bytes
SHA-256: 543f168e2e3623a19f6bbc5a13aa5121bb02914236c94bfdea1fa75fbbc41265
font_02_sfnt_off00013c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 10924 bytes
SHA-256: f3236c965c54e02e97ab8ef2519bfe23f5f1089719238aa52178e06cc94cb184

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