Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfe88624c9116b9…

MALICIOUS

PDF

113.5 KB Created: 2021-07-01 15:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7e1705085ef35c4198a20944af4ca9 SHA-1: 3b078781584fb40beaa9906176fd93d48faa3819 SHA-256: acfe88624c9116b98a3a48434c707e8df28664631f3480fd61e04c10d21dc8c5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The presence of multiple unknown URLs hosted on various domains further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/dc446877a78db0c872f1351c6845e683/buwupimozugarakumixojifos.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160876d779dfda---27741696941.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/sumfb5ofd83s5e8buhpdqeprvo/51420113890.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1536f3bd08---dozadi.pdf
    • http://traiteur-ribot.fr/userfiles/file/kejalipogezagalizadaxiwew.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02532d6e9---87957693447.pdf
    • http://agendatourvietnam.com/hinhanh/file/zajaguzotefagafu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s5umq33tii7n2icnq79q8kv6l6/71779009817.pdf
    • http://pensionpoint.cz/userfiles/files/46667186907.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079730236b92---3978180111.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/69412402766.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/20d94b0be5c7a8d65f5a73fa28a23de7/16209867454.pdf
    • http://wamer.org/userfiles/file/76280437501.pdf
    • http://co-wemart.com/careeruserfiles/file/66820962926.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cbv6vue9nbiuaahkiji06hf7p2/mutunafowutajavusi.pdf
    • http://mnarch.it/userfiles/files/rudeliroriposu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=separate+legal+existence
    • 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_off00015a20.bin
bf1dda4e798f2e07d2bb9636b4fd89e5c7f6b6410b7d5c4b05c686ef880a6d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A20 17908 bytes
font_01_sfnt_off000188d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188D5 16792 bytes
font_02_sfnt_off0001a0ec.bin
471440015fe0f4da0fe2eb37feebedfebad40d6e5e2cb548dbfdc1d0ac9e559c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EC 10604 bytes

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