Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4f17e73ea550d1…

MALICIOUS

PDF

63.6 KB Created: 2021-05-18 07:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237e84bf44c0718512b3705de91b5ef1 SHA-1: cacf66e39b25dbcc4e8f593f5537c0128612ad84 SHA-256: ff4f17e73ea550d1447555778bbd1a23dd86fbbbd9e2fe0257816b2976a05026
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to exploit users through phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8120

Heuristics 5

  • 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
  • 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://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb5ec28a09cd1e9d07126547a8acdaf8/83203311668.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a50d9ec72447f3485cde90beb7c8e49e/zixisovozowaru.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/41a3af35e5d44db427c4cabfa153fe38/zoxatajutabefumeg.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2275720b8b---75957815566.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812df818800---88186939155.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c41a3501f3ee87ade2ad18d761868aad/7628198143.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080f68c5921f---99317593472.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3cbe07d60dc8c2447bd548955de1640f/ferab.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hfmm3tur5m2d4sql1d6skv1iak/porudekuposin.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715bc1cfaf6---66515661350.pdf
    • http://agiusfuneraldirectors.com/files/file/49096493052.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0aaae73343bbf5df25188dfff0adaae1/40284484259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=captain+hook+monologue+peter+pan
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb56.bin
9c230035dbc7246dd50b072bcc6aeba72396120c7b9569b6c347c6e53b2bee9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 5024 bytes
font_01_sfnt_off0000dc41.bin
bd30e25701a33fcb263e4c160b7c488e6cb65476c324f68c937bce5ce9a6db20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10880 bytes

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