Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4b48afef98716d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-04 21:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e1250c77807f3bda62f8e2be0b1a93a7 SHA-1: 7dfa6d4ec79c033199d04663cdfc25314f520a5e SHA-256: 6d4b48afef98716d4eed7aa8eba8763af8957509b1f77dbc15a9a2143df02b6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to multiple disposable hosting domains, suggesting an effort to obscure the ultimate destination. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lamaisonducoeur.ca/upload/editor/file/vuzipowugonevefagisufate.pdf In PDF document text
    • https://hospvetcentral.pt/site/upload/file/zifan.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tafoma.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93ad978a87---pedudex.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8bquepqp3i8t64s6f0d0gd3ilv/1548928437.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd00906735---75516095882.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/30240462971.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8361f6c29fdb01cb9046469ecd425b71/gubomozel.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607038bae8cfd---57659576430.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/lekiniluli.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/45425990734.pdfIn PDF document text
    • http://anupbolivia.com/images/files/mulixo.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091526bd2efe---moralatekefaboke.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593224d6d9---xuvalalazetagotada.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca3021b1e---11393556931.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xidematesojunusinubelata.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jv1jg93uarhmn9selu5nq0d421/manife.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1816d5c500ad73a11fd46b9219b0a992/98290951035.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9u62e6c21md2qpuihgbfujh210/38252588638.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2c12877efdf757c832fa7924aead1b50/25096228782.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76062693755.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075800dc860b---91446363296.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/57917283144.pdfIn PDF document text
    • http://chayka-svg.ru/files/somedexupapesomukezupex.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/fujike.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210603034123.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/49130810268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bulging+fracture+anklePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 10468 bytes
SHA-256: 2645bdf28c90ab57ba3d6a86929884ef05ba3d2e691564145e267100b43f4d17
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16560 bytes
SHA-256: 2bc90c9487e827d5e65f24581ea67d3bd4026c5217013f00adedfb2550f65448

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