Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76e20fec5e35d60…

MALICIOUS

PDF

93.6 KB Created: 2021-06-30 00:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 170984513effa6a23372ab199fe0233c SHA-1: cc65a3aed7b2e6f72db19a612a6395aa49f80fa8 SHA-256: c76e20fec5e35d605a5a1a1aba33e60d5465def4cf08b9e461b24bd94b191135
156 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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=principles+of+quantum+theory
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cbaf3f37d0761c7e5d7bc97711454a98/48314910401.pdf
    • http://megaprestige.ru/uploads/files/lilabofexava.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a0b8ea28f83896c4072697bc5d3bde29/nukuvirowav.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/04f4ddbbaad99caab9125c17d332a153/jakupenatuta.pdf
    • http://clairvoyantinfotech.com/demo/images/88997501078.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/42665931026c22ac47176cce0277294a/9208047588.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/u0lj25lc91kd6aeoeblcg7flc6/vimifiparenusunug.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/674282453f8d317f2aa917a04c6d9090/bolubelesel.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fe119f7f24572f858e823721cf1279a1/nodikotukujomiwuvar.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d470bfad---sinojazipugad.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/nd7hovsfut3rs56njpe1pacdfo/mobewaz.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/43157483384.pdf
    • https://suma.ca/upload/editor/file/74833521155.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a94250d0edb---wupogekiduku.pdf
    • http://lasfyy.com/uploadfile/file/20210605123819041.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab8704553d555fe859fda4564df41b2d/50220105523.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jk6hgah57pgepbce2d0404ocg2/timinu.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cd81790c---lugakiwipol.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d01b96e8e---jokeruxigufalunulavo.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gr0aamp9vh9fbsbln5e0n9vl02/62138043416.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/097ac6fc7dc7b1a076a38f257a6f939d/mukofof.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b919db4a1ae---moxulasowiteb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109af.bin
9d928a34ce9b0dfe9f751bf0f15c5ede964406e518de3e4f63a8cedc64851c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 17548 bytes
font_01_sfnt_off00013748.bin
11d2116acfdef0bfebd5346d72ba387f725bcfe5a6c2ed2dfbdbe092a8bca329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 11108 bytes
font_02_sfnt_off00015101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15101 16792 bytes

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