Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd8fc0838dc3f5…

MALICIOUS

PDF

94.8 KB Created: 2021-06-30 02:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3edf5d80b761dafbc6f9055ff80f5eb3 SHA-1: 6233cc023f5aea5992dc60b1a48d9052fe19da2d SHA-256: 6bdd8fc0838dc3f5e2e511e914d7514bcbfefa3a9797ac2efe600e9a7d9bf302
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a pattern of malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efe7183c0cfdf0e2b501be6112e2debd/sawetuvodukem.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c808918a1---dojopedanuxelera.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4df7a5e03---73753266298.pdf
    • https://amitadevnani.com/userfiles/file/sovalen.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cf0157e3810ca7b2de08bd3bee6922fd/mukuwizixuzegajekaf.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nha85u2s5u36j0qeat5sodgjn0/45214220388.pdf
    • http://tcihk.com/userfiles/93502417289.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cc68f6f64507154d5bc6145dde69020e/34275688212.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/nufiror.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rol67677e893rtvc4f7pdfdvqf/28390148666.pdf
    • https://communeouchamps.fr/userfiles/file/19273774242.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d31e30a915daf073c70ce35a6d0b58f0/7836668818.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6e41af19---81602199373.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897c773ea6f---10513992162.pdf
    • http://sevimticaret.net/userfiles/file/31009088162.pdf
    • http://land89.com/ckupload/files/bisatodewobubelusol.pdf
    • http://www.allatpatikapecs.hu/images/file/perukipaxomupitepub.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c767b6c95fb87e331cf75fd7aa59e9e3/xadiju.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb640d32bc---17737442465.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1a77b850367bfdf304f15da38dbbaab7/37998504571.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/semijusot.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ada91cf77---7174718245.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17dd2995a18bfe1b1999ab49388b76e5/58436765736.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4473b27e9298972144782f60478cb646/53874837267.pdf
    • http://sport-way.ru/img/file/raxak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+5+compressed+file+for+pc
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 16792 bytes
font_01_sfnt_off000125fe.bin
3a7de064be5a3ba1decdb644802da8ed8b74c12feb4130f50abd89e791c62ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 10848 bytes
font_02_sfnt_off00013f1e.bin
46e2ea2e83ee977b45bcf2007997b2e9756f11aa90ecd5667dde83fa12a96bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1E 18084 bytes