Malicious PDF — malware analysis report

Static analysis result for SHA-256 deec33f3ef397e10…

MALICIOUS

PDF

77.1 KB Created: 2021-06-12 04:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c01db98a29b177d2e7fc25072b82519 SHA-1: 57999d7381e911bec7a1bc9f7a0a9ad7a674047d SHA-256: deec33f3ef397e1061684d0821d83a17a698d883de6cd93d38988e46275aa9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to exploit users through deceptive content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=passage+for+ukg
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/dab17e862b98d9c656edcf69b0c4a197/nagowekotake.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b231aa6ce4165163c5c47c88c996b20/tovotafofutevujejodi.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2867d71011---niderikegixoxabus.pdf
    • https://plentis.eu/ckfinder/userfiles/files/mazewevevatus.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7a497c8d---55695374996.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f0701e1f---11727503433.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cd503fcdd3e2dc409c41534064ad056d/92830788406.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074259fdbc24---filagugudewib.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f34815f3---72037694506.pdf
    • http://msamerica.net/clients/873634/File/83081704636.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f87b663---89216412380.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/im41c72smvqesvr70ve2g0922b/tepakibezileviburapodik.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df73deddaa---54074620382.pdf
    • http://archerelectricsupply.com/userfiles/file/548558878.pdf
    • http://vladjurnalist.ru/archive/file/xomitopum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cf.bin
673ec3598576bcfa6f85df87531614a200b64c62ebbe5908eff2ae4255bcb094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 4616 bytes
font_01_sfnt_off0000f494.bin
e9f9b6ef1ad4cef355697a1294ff757a3937b60ee09b0478b43940782d72e7a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10920 bytes
font_02_sfnt_off000119bb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 4324 bytes

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