Malicious PDF — malware analysis report

Static analysis result for SHA-256 330d9e1d0806bffd…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 03:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5b8668c00acffc8d8d3f6bcda3a0a6b SHA-1: 476fc649dc4831383127f4111911c1eea38df717 SHA-256: 330d9e1d0806bffdcd1f24e130fcf19693051bd3c7442948e909c0b26a2f7d7e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to directing users to malicious content or further exploitation. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=when+will+all+the+ice+melt+on+earth PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9cf8b11e3---wimamadozekafibudanabi.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/ed99e6f9a89cb3428979b896cdf3d550/5894057720.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vikejowizoti.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/muwudotatikufu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/rumepape.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f68440c99---jovepefatimarolote.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37fc635ce7---nozupaxuseloriri.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c40e9b470b8f76eb3a9968c60630d56c/vurazobazuzasuzifi.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d866da05---85722281931.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/93746796847.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2sphrunsiuh6cqcq9bcnd9p00s/92241923414.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aaab19d76---gikowerizanitewos.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2fb9c69a113301d57a552122e7a3faf2/xugitodibusisiwekimexaz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fut9h3sq7eqh6ifglpohqe65e3/11398773194.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/zipaxawifowidafuwe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cddf4c83aec---gesutixadazanuvu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b5d10a858---94805869537.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/eaf5ecc0f45134d9319c31ee40c259a3/50018532800.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc51048f0---zuwavabajupus.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0b52c9d88---gosopevunedagepirakedamod.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe10715946---zekimomosefegopiduxalali.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e59a6dc63d621e6491da8b7e8898bd47/50106558547.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sekuvumogowuwageneginoses.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e43841e1b7e50feedbca9779c8ba3b8a/80530753914.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/854bbfc96c0b7f98b9ab4f91bdf93165/jazefodamuwevu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e529cd8b7---motubiziwazifokigugevok.pdfIn PDF document text
    • 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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 10404 bytes
SHA-256: f6a6c8bba63f8c13669c44dd1613b48091b283918c84f90e20824a12a8a6de52
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 16940 bytes
SHA-256: 473259157aa7d5e4e6ca10bc76b22b8bc6a08f88970404d4565ec250ab0d0337

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