Malicious PDF — malware analysis report

Static analysis result for SHA-256 d330470c83c275bb…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 03:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f741373216ab267188555eb8c28fa905 SHA-1: 9aa9bdabc8ba8e32ed97c4e893a6af03930d053c SHA-256: d330470c83c275bb46c8b9543097655b7d8e275fb49920919a6f79cfce7b5015
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves leveraging these links to potentially deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jodhpurtravels.com/nbloom/fckuploads/file/94887385937.pdf In PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20690032993.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/74181943793.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/kitumamefuduxitexewusi.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/44476799621.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091852bc8728---59888939152.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09a308c35---55158346024.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/65365829047.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/12188586430.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0dac900dc---47709085494.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/48199920203.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/36997569034.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6a2dc25b---23708471913.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/noxexojewoxezutuxu.pdfIn PDF document text
    • http://meskerjager.nl/media/files/finatubevinadufed.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6794fbfa162c0300212558dc9bd7a0d0/takifobusuropavovo.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/61891746252.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafed3d7fc---vuzijowusogojimemu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/37ae7b7eea883d62106fdc30ed405771/gubetajokopiwa.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/resilepadit.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nf471ejrqvak39oeghc5cffbej/3790130756.pdfIn PDF document text
    • http://landpas.pl/upload/file/koxosupadunowutid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dengue+fever+can+you+get+it+twicePDF 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 10664 bytes
SHA-256: 809664ded004fc9d1f1780e62e015780232074dfedfaad1df0ade24669a82edb
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16696 bytes
SHA-256: dec405f54353e8f87bed0ef234a2aaa9a002ce6c1bc42b067e7f6cfc5b6bd8db
font_02_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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