Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a36a0fd79be46b5…

MALICIOUS

PDF

90.9 KB Created: 2021-06-23 02:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5b41164fac74b1934386261befa6c605 SHA-1: 841165e57f7ffce887ce7bca780e71192aabc093 SHA-256: 1a36a0fd79be46b59363803d885cff3daa6d968f4b9663bc9ffe471efacaaf32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26ec5155---nufivopirozugedinep.pdf In PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a988c944bd5---pejodajejejedavuju.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rh2ng1el9i8mlf7j2cd76o2lru/jumaxegokozepam.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/fumedepid.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/csg7vn6tre4gq7m9ci6gmrstd5/76362560682.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/62602951562.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/jvonahlrbbmsi7m1lo167u01c5/jatojimek.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5dffe1b135ddd904eb5f6cd6c22d8769/kokumupexib.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ii5kidu8uea77ea2sv9qdq40d0/50952050958.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e666cc1ec1---wegivosujajanolorezi.pdfIn PDF document text
    • http://candientushinko.com/images/file/lataru.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5be62016bb3bf967f8e69841330ec9c2/pexaxonovufilave.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f167bb3c04d4ab8294f56e23010e080b/tomemezuboguv.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/16835874414.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6dcf6062c23c7790d14b74c58fb4d1a5/mofikimur.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4f8140a3db3358ad7a4737a8f450deed/muleruweminuz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a8666e1ff91a8e7e347e5046650c7328/wakiwoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=all+watchman+nee+books+pdf+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 6484 bytes
SHA-256: b4bc5d13252ec1a755b4bb581ffb08b3bac5e65c95ed8c67ae563288da6f6394
font_01_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 5680 bytes
SHA-256: 3e987fdd90d6cb698dfcf96662cb8609c4957e7ac4aaf21413b12036dc721f49
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 11324 bytes
SHA-256: 5ff34a5ff12659c981cb4afd04c4232025779e6746691ed5a9bf02aee5249756

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