Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81f5dc55375e511…

MALICIOUS

PDF

81.8 KB Created: 2021-05-27 18:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb76fc70f9f7e6bee21864ed54782f9b SHA-1: d068004774330762a769f3bb389e5710381f7c1b SHA-256: c81f5dc55375e511f73a96b9e981a91717de057d6d59c51d9758d7654feb6e71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning. No scripts were extracted, but the presence of multiple external URIs and the heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8726

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608561559ad5d---67330903564.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/821c4568b6c8a2c58feb88dba73efa6c/90800698857.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2ba089de---vaniregonodor.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf5a8ef55d958325300b0847dfaed765/netejotelafebemit.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ac0246641c218036449f814865dc3a24/dumojazadaropokogu.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ecf22fa9f---nibokolalijakowesitudu.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613885f10d---47999261547.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5oqg5cfd85fsoiidh8j7idfnaj/12232918838.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f6442e4ec4f48969182594bd3002f874/bugezasezibajigir.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d360599426---kanotajafubibuku.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608606a993dee---95768247470.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/754dab9a359f1d7d2e4fa1b985fc726c/89495199121.pdf
    • http://malbreil.com/userfiles/file/wawafagozomi.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ab625fc0c66904cbe434c560cccd5dc/tusiwajuzejar.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0868996f1873d139d3c71428bd06008b/89048254104.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=safe+agile+certification+exam+questions+and+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3a.bin
c83a1408996999d99421a22ca22fb3b9a5bd4ec86f6beee5c57a3d0f034f43cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 5612 bytes
font_01_sfnt_off00010f3b.bin
82760c28698e768e9523f781de68a8b324ca929d2bb9cdd83b60bb04b1d8739c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11188 bytes
font_02_sfnt_off0001354e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 4324 bytes

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