Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25c9986cc5a540e…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 19:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db36ad124065ee65ec8203c2efc8cfc9 SHA-1: 664135ce7b44cda84ce6f31a1ad4fdedea1196c3 SHA-256: f25c9986cc5a540e9b69067ec5b0eed98aba2b0a380c66741c2ae87d75bde80a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains. This suggests the document's primary purpose is to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://agentcctv.com/userfiles/file/lubifusipuporegodomo.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5d6be1109e69f9ba042b4f8917cf664b/4957640504.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/193e647ee902bd36c895dc3d47564672/68965765016.pdf
    • https://behagi.eus/files/galeria/files/41745678401.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160857d8f50a9c---vifilonozelaxupip.pdf
    • https://stancijanegrin.com/UserFiles/files/85380022372.pdf
    • https://soechi.net/userfiles/file/nawen.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d6822223a43ba1006238b42a1ac2d673/mitumoxozugijupad.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/av1n386808cb2apnnhncvclh6v/20073646397.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b3f994f3---pudator.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a9514bf3c20d2a0e74f9ad6fd3b63dfd/fafowobadada.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5a1f995a7b11e3be2b2abaa351631ba5/86016919733.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6c055afc---82068821923.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16091463c6c1af---90931746664.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b9e0d85c9a7c707bde5ac447c3e17a39/967841550.pdf
    • http://baugeraeteverleih.de/benutzerdateien/56625176837.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b36fbe5a7---visajewubazak.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0468cbc4dc90bff71c8c4a43119190a5/fatafu.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/fofimafubepuf.pdf
    • http://tunglamgarden.com/images/fck/file/zujezedivev.pdf
    • http://hwayinn.com/image/files/20210626_082509.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=linksys+n+router+manual
    • 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_off0000f7a8.bin
8c229a0f38f45a91b10787fa4757c81b5826fe46a91faa4a0254c6225e54a457
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 17160 bytes
font_01_sfnt_off00012493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 16792 bytes
font_02_sfnt_off00013caa.bin
bf9e96315978e5d3932caf553d09e4e0da27ee2e707112117870f091c73ac0cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAA 10532 bytes