Malicious PDF — malware analysis report

Static analysis result for SHA-256 354fb9d1c259763f…

MALICIOUS

PDF

67.5 KB Created: 2021-05-14 12:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea85663a2f37edaf0af5507635eb055d SHA-1: cbbd97bbf3f3b0469afec01ee134df5a16446551 SHA-256: 354fb9d1c259763f12f43a583ed28b0e146a3f06dc3c3f600b2ff4ec292b3f4d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate it functions as a link farm, with multiple distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://podlahypilat.cz/admin/file/juritosidasitibuj.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160913d7da9784---saperomegik.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/87ldaf65nipchfripcehikt494/finekiruxomom.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebc5d7935---69490080226.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759867c6bad---86916097820.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5j92ppp7kq7i3puegf3r1u57gs/dunofizususejuwot.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/55u2d89mt5vba2o0ror6agrph1/tenajiv.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a2414569e9688bd991b7e902d6114381/31032425757.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092edbc1b23b---givurusekibojaki.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9lb0t411so5ioatmt2r3m8h8a2/wugirokumoxuvubos.pdf
    • http://sotel-perm.ru/site/file/62518724309.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1dbf31092---80602795126.pdf
    • http://www.anclupnapoli.it/userfiles/file/97010996304.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enfer+labs+bvd+testing+form
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7a.bin
4c35b3dd1ba045d9345909bc66927873759e092f5d016c4c01798adfe7dd8b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 5384 bytes
font_01_sfnt_off0000ddc1.bin
204a3db6839e28f948b12c335442a29f1755d903526682846792b9e6bf74b546		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 10264 bytes

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