Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbfac8fa6c29b57…

MALICIOUS

PDF

162.3 KB Created: 2021-06-27 20:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42671804454282ce4fab8461adea3ef7 SHA-1: f86e5769f301a40309d46fe26dfd90d4e39764bf SHA-256: 8fbfac8fa6c29b579591bf7f4bd0c185d42f89c53966f9f249ee112dd0bd2438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7048d463fc---tixivowetanuroligeme.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb6546202---81487985322.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3e9952dd---21561770075.pdf
    • http://akcjonariusz.com/UserFiles/file/wozesadusozuga.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/13244353222.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u7pjteagtse78u0uac0vei750l/63262521448.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e74955301---84234203404.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269fe56085---32205856914.pdf
    • http://tutek.eu/userfiles/file/mudurulepigov.pdf
    • http://yacpa.org/yacpafiles/file/kabiruxe.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0b0d7e47---22111850486.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c932879952cb148a041916472bdbd3c0/78440813593.pdf
    • http://king-pro.com/userfiles/files/72063931968.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279c290acd---gigadukexolil.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6caaae64---74601355424.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ab274f14c190b47946f1a5e5d99ecebe/pujivonofuja.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8329apjf2e9kq9s643612k7hrf/gizobadapo.pdf
    • https://micro-churches.net/uploads/file/gipakag.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa62ad2af---volegosetedaw.pdf
    • https://tonitomov.com/picture/file/73076663680.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ef3b649e36464699a865d11a308affb/53010168082.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5c8caaced729e608e8f3c0a90f51fd1e/61196943242.pdf
    • http://sjar-tech.com/uploadfile/file///2021060410472681.pdf
    • http://ibb-online.ru/f/file/tovaberitexibi.pdf
    • http://biomassasia.net/data_ed/userfiles/file/78122908092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fathers+day+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e39e.bin
1a3203ba45af2307474a45de0f1c29d225eb4cd35fe4736fbc87323386db242a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E39E 16644 bytes
font_01_sfnt_off0001fb5c.bin
cda8daaecff4117d6d1658711b5ad6ea4c35c008990cd2f8a630b9ce09abbffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB5C 29508 bytes
font_02_sfnt_off00023f01.bin
81cb993889df16ae1b43177ac22d747dbeaf15f36bdb74e6dec3a5162b02d8f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23F01 2796 bytes
font_03_sfnt_off00024ac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24AC3 16792 bytes
font_04_sfnt_off000262da.bin
6cf109c6ebdbdd154f823cb9b732e04bef335aa39cdce952b746e9b0db6728d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x262DA 10368 bytes

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