Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bef80f509a5265…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 16:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eb830927553eb7804c907e4b4bdc2b8 SHA-1: 077a5a11fee6866112c71f328b454d1b82f4c626 SHA-256: 45bef80f509a5265b1d4a793bab6906f99f62fbaf6df7b5c12f2e23f03481cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload directories suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee74ee55ce---81243339995.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8add191b76ba6430fa1fa2473e251880/negos.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/p5ojqio4mml1m1vrb1np7sc3a7/70316736266.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/18123882595.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/86539276609.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080b58e7cff8---puzik.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/99219816260.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/nagebonujidu.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/73571221139.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/31787518724.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70689989852.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/21257353645.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2252a8e96582315e52b8b8448d13af0/94540386719.pdfIn PDF document text
    • https://vpmemorial.net/images/file/61278957501.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/12ce971ff19e3e86aa8f44b1c8be6689/42642596143.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/85e3683175347ea387d65d6ee7807e32/buredozawogo.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/16463290646.pdfIn PDF document text
    • http://www.toptehnik.si/images/putivimudanofunomowuwuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=derecho+privado+romano+guillermo+floris+margadant+pdf+gratisPDF 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 20760 bytes
SHA-256: 3170d1c51046ff41a0245cf49b9bff3951169365def254682feffaa1815439db
font_01_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 11232 bytes
SHA-256: 167d83f563d0907fadd43502d12b1a210a1a3b0561a354f86e24449d857d19e4
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1