Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afe7d8e63830b69…

MALICIOUS

PDF

96.8 KB Created: 2021-07-20 08:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f8cf520356ea26dfc8a55c6cd9fc148 SHA-1: fabc027e4cc85b3c84c63ed9e9ca2858e921efd2 SHA-256: 3afe7d8e63830b69b20c1d66468ae87aa581eb07e74e696f5bdf9296428fbb72
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/movudimurazelefinadurise.pdf In PDF document text
    • http://czdashan.cn/uploadfile/file/2021050204413073499.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/kefibenomenajigepug.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086125ebf32c---37156029659.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160725f41bdda3---33049191420.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052204413415.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ac31c0b2fcdf1fda0898b292ba3b98ef/bamexawigitelaxedatul.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/34899707452.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/femafi.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6e202b05551e52dafe043fbcb2768f80/davajuluzugakefim.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/wokivedaxefigilodegusum.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/lomirusumirar.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa1be2b0b---36541961091.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/30031340037.pdfIn PDF document text
    • http://abwrva.com/uploads/files/70812941603.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/25589850369.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40f584578---pusilivegepab.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bd2aeffde64a9ac6de12fd4012333e3a/xebuda.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kanifoko.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/22310095810.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac11e310b6a067220586802f62fc5d62/kekawa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0123e0979a---rinazodebabileniwukoren.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/74492528688.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a00513d2---68413922573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+k+mean+in+money+termsPDF 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_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 17464 bytes
SHA-256: a5e1eb4b8087b5060f24d084aeed0ec3c79443132cceba99b8d637a8d5640cdb
font_01_sfnt_off00014526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14526 10668 bytes
SHA-256: 774ded8eb2208ae59f5b3fb1942844c459432628d3d363f377fd1bcdbae2c495
font_02_sfnt_off00015d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1