Malicious PDF — malware analysis report

Static analysis result for SHA-256 111f3565f4cd8592…

MALICIOUS

PDF

82.3 KB Created: 2021-06-17 21:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7808ed20637b941083745fdd85e3f641 SHA-1: b82c33dadf96ed5f7bad4118fb5a2742e3ebbe42 SHA-256: 111f3565f4cd8592ba27a513a8961e598ac0e42797071cd016c4da08a6745b32
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1cgfq4frug1oa7k6umrtplgjrm/88936498194.pdf In PDF document text
    • https://bestcoloringpages.com/userfiles/file/44624883659.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/78848344879.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/rogomedividosoxofugolix.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97e4471eeb---96158929796.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/65a1d6e20111a51533961628f3278c5a/xoposorud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854ce05728---regitojupel.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bbj264h7ra1d8k0gq09mu0a82s/finadagas.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bdfa88e95eafe1f10c14086ca135e2c/pulipovubigabate.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/43371584118.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160987a3ee73f9---fikexo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/lejoropujobu.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/a6v4taakdmn4mbkmkukbo2i5la/18838591212.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/95iik0k2gcor95m8agmlami3ca/81871573606.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/54pgqf4n908rr222ok2ne1fvvb/10341360883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=babul+meriya+gudiya+tere+kar+rahiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 5080 bytes
SHA-256: 3a82062f2f64d90387a7c68271dfe43efa37a48c9f739c86f9145bb2b34e396e
font_01_sfnt_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 2328 bytes
SHA-256: f6a35708c858cd9b5db990d3861a19430b78e6c6c186d696257d1513d278e4e6
font_02_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 10156 bytes
SHA-256: eaa8b11a66cad3a2d178a51d0401e2db43841ad9de01aba40ca7184892f44a59
font_03_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_04_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 10440 bytes
SHA-256: 7633e95febe1533043f23bc4cb03c27dc483c5fd4403d868b2a49e394720a063

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