Malicious PDF — malware analysis report

Static analysis result for SHA-256 145dfde5bb4c791e…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 16:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1c68fdea2eb58a13efea2a7c63742ec SHA-1: 8aeca0af0af6767e17f6cf712150c7b087666b33 SHA-256: 145dfde5bb4c791e224374c4e218f1e48e63d86bc9af442228d05315e48f0691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, which is a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/33103686418.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1a5d9ftlc1fjk0fthqupgvcqp9/jujezuritutimisemas.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3314f65ccdf3cdc3fc0b0f87a63fe8d0/jixunerobopazukeraj.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/1471577611.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8892869911b7fa358d0ff7eb74a83b7c/futesugasaliwiwirewerogug.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8d51f306---mozofetudorifo.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e71213975---toxalu.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b321ddf8a---xazekukugesugawobavesi.pdf
    • https://bisnismedsos.com/userfiles/file/bonawesovuroju.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6f23cf80eb94f581e4ca3982f4136d27/fapesogapedisukiwoz.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72d4ecab9---33813771817.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/47g7o1ngqths8mfcih2n1t6dm9/41940396983.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/f1d1633e3a2d525e5ea07725bb7d9c95/katamimobupuzizik.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qhfq4pdt94afuj5r315djgdku6/jojalesopubimuda.pdf
    • http://bijverhoeven.nl/uploads/files/paxigapejigobibelu.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a6d17e1f---perosoxotuvaseloweves.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad70c7264c6---50141953127.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/13931162852.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/31jtdtcn8cfm7mpdbe4s4gs9bvl6fi69/teneluri.pdf
    • https://rm-parketi.si/uploads/bosozixetegusomojilo.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gco7ee837gjlpgl9ehrfl3jqj8/nanulakebud.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be6de63b6ea---wikunalitevelu.pdf
    • http://findmecakes.com/userfiles/files/vizegufoj.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84e855909---vanivukugelonudaloxeve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dr+christie+paediatrician
    • 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_off0000f084.bin
b97b976d28e2594ac1ba8a23cfc1d3ec36e8341a6014e9d99f8d2e4b5746d938
pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 17608 bytes
font_01_sfnt_off00011e9d.bin
6762a87cb56bffa239d08f93562308b37a2d8443bcab4676945dc3c364e244fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 10448 bytes
font_02_sfnt_off00013646.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13646 16792 bytes