Malicious PDF — malware analysis report

Static analysis result for SHA-256 c179fb814fcaf2ca…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 18:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e58667d0cd0824230a86180c379e144 SHA-1: 81e0b1f946a1357af550bbadfcf38535401da129 SHA-256: c179fb814fcaf2caf69f7b1549e34c0853b653ea70621405cd2024118c130c1a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be a link farm, likely for SEO poisoning or to distribute further malicious content, rather than a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e6c7d22b1933465816b583692de1f33/87480700343.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6891e2a5---90823583735.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762ecd858d6---66085704100.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13567796---vesewapasebubimoteben.pdf
    • https://tvsporedi.si/vsebina/4829263692.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/86322050103.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0fe1a7cb129a884c98a46e698b467352/11227374900.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6b472dfa4---tolunusezeruzifudor.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c86ac797d06434d58ed8a165d3fb0f00/fifaponovopefow.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d7bb3fa487e40f4eab02eb6397afd186/91192695804.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d7ae01d119748dab5e06abcbe7e40ac7/22959894541.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/719c8bf960fbf0d55de797b173fe54ea/xefusalekajafamakinexuna.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965e21aee37---lixer.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080b322ca8ac---44567047714.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2481886d2---rijigipizo.pdf
    • http://footstepfloor.com/upfiles/files/duvodubejisumutamexipeben.pdf
    • http://jiangsutravel.kr/userfiles/files/20210605_050039.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aa4de991cdeb944d32fb7069e78e575c/gubiwavuzebibemulufar.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8b42e48488df88aecc89f57b2df6391b/girumebipixurojofe.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608abe8924d5e---foluxobivobipimasuva.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/81e8c347d48fef192246d713c4378e0f/11141694599.pdf
    • https://service-panev.com/userfiles/bolunolove.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trails+of+cold+steel+2+characters
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff9.bin
936c44be39f6e87b5ca38ffc95ac939797187c778cf262857b1fbd7abbaa571f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 5220 bytes
font_01_sfnt_off000102a2.bin
5fa345cd66132480677cca6507688fe5b473dc8baf9afba070411dc9917da431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10552 bytes
font_02_sfnt_off00011ae4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes
font_03_sfnt_off000132f6.bin
1558e184b3c025169d6c06806359f420cb2621098aee7039da1756b49ab0b271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 17168 bytes

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