Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc26d040dcbd546b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 11:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33a1ad585309eb0ce38dc972e1b580c1 SHA-1: 0d41f892497cee360d67ecb804935d2b6c19bea0 SHA-256: cc26d040dcbd546b04124d4102ab3ef59ec7824f9f8ea258e5ed76196711c944
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The document body is unreadable, but the heuristics strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f08fdbce3b8c3a23193acf2c5412c8bb/pokaninofotidem.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6s2cvft8vesujnnie2n9u9svt5/pixazukojamotu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d676b4db---fijonojuxoga.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc14ae394---55087382624.pdf
    • http://korean-school.hu/hangul/userfiles/file/fipus.pdf
    • http://tort-art.ru/userfiles/file/zusasitatiwofinobune.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b48e6df8d---7611303201.pdf
    • http://aristosaigonhotel.vn/uploads/files/51789231859.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08316047c---28481755014.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/57478815a7baa2a735d92c1c426ff999/lepekadaxutujeteduvut.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ruadrdr66ok2il2j6mpc4lei0/71200109224.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f914f3f11---lekebafopelojof.pdf
    • https://vannordenvastgoed.nl/userfiles/file/rolupiw.pdf
    • https://eprobatdz.com/ckfinder/userfiles/files/22982330361.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76362009932.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/53c6750260cf030976d5d4aac39d1edd/sodurejor.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed4099045---30610031402.pdf
    • http://project-lovcen.me/userfiles/file/52675284543.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a60fb02---sidarobabopafibabezutamop.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/565b1ab8a937653a2e46d923f0dca463/53496660144.pdf
    • http://bettynblue.com/upload/fck_img/20210601/file/wizubufararewalenoruw.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kkqn1fu8tae0m2k21rinlcfjda/figoxaw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=call+center+interview+questions+for+freshers
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/55290cced7f2459b9ec844837083d6e7/xilij.pdf
    • 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_off0000dcd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 16792 bytes
font_01_sfnt_off0000f4e8.bin
48a1df6e3da8da4e9f3fbe1b8d4b6d26ace9964e296905c13ec8915d72e13bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 16124 bytes
font_02_sfnt_off00011e82.bin
eaa948d5c2e66d1eb7b2c269984a54b23a2a968774bac162f63cda15d8bb1a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 10860 bytes

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