Malicious PDF — malware analysis report

Static analysis result for SHA-256 922f7d806998b6d4…

MALICIOUS

PDF

84.1 KB Created: 2021-07-18 04:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7c31940c82eec00a6e8e82a69b52183 SHA-1: e3c6a3659dd13710bce66948fb3d0585a2590dc9 SHA-256: 922f7d806998b6d41359ef8ab5f81eae0e13eef28ad5188cd8643cfacf86778d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially untrusted hosting locations. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest this document is designed to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://topnotchimports.com/ckfinder/userfiles/files/tapalunubivadoveruvageg.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71e4b015f---32382524927.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/45b581c79396232d19c6b06aeed31a63/8439252870.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607effe484403---bafifavatirezinukak.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/figitodedonamifaf.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nkl59eok1hee93k5jiteiibgqc/85158370154.pdf
    • https://fultoys.com/userfiles/sujalegajabipedoritaw.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556823d392bdb6ef4598731a0b6ea411/72074349907.pdf
    • http://aklond.com/UploadFilesfile///2021061114423954.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/wamogivokibo.pdf
    • http://jmk.kr/ckfinder/userfiles/files/50207487518.pdf
    • http://accessiblevehicleservices.com/userfiles/file/xululuwapuwipakodezup.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af59a713670---zimulonuxazu.pdf
    • http://bnblspecialities.com/userfiles/files/8466589290.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6359597f48cc72c1245242a0a9bb2814/38270681537.pdf
    • http://tebsc.com/clients/84181/File/lulobugotif.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086884105db9---vinelabipiruven.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/56fc354ffd8c4cece1639ed5560a0e02/46628665308.pdf
    • http://annjulieskarpmo.com/userfiles/file/vonirazavufobodalip.pdf
    • http://masan315.net/board/imagefile/file/3073828653.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9847f3cae0---xaruretenekeput.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c8ae152a9---14453300766.pdf
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+linearize+data+in+excel
    • 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_off0000e478.bin
a60d6d428a4c497ceb6f22429ef467ed2a7b9ca242f74fef8531aae1322a56b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 17748 bytes
font_01_sfnt_off00011335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 16792 bytes
font_02_sfnt_off00012b4c.bin
98f034077fc02a75c9be35c3d14ab1cc90c905f296fc2048ea6ea2e1c10ddd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 10436 bytes