Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc039afd3cee402…

MALICIOUS

PDF

85.7 KB Created: 2021-06-20 02:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2287ef4f861686a6edcbbcc03fe26fd2 SHA-1: a368c53a83e67ed3f4dbe66e42431c3a6163ecef SHA-256: 0bc039afd3cee4023cfd920794b1d5e85d9d5be6c33e42a071f3e6f93b71fde7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links suggest an attempt to host and distribute further malicious content, likely other PDFs, as indicated by the URL patterns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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 http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36a811d85---98658167984.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87c55a1fd---11304899198.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mifadivekagafod.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/bosabazekaramo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sobujanufe.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/texajesonojozulilameworaj.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37971d688c---xumemup.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db559537ea---pasimisibix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f03def00f---dekalipago.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/09e5b1692bafefa1aa3271f6ca663e08/jovigik.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wamir.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f4bffe58b50a90e625c298f63ee62d/peguv.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
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=v+movie+songs+mp3+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_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 5172 bytes
SHA-256: a1e9d82ffb46385b0127d5f28738a005a6c89eecd34064c2a1abfc9de9796b49
font_01_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 11100 bytes
SHA-256: e40ee364e4fb04f183e4a3c61a1d074513480fe4c5483dc5e0004863b0c75ddc
font_02_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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