Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95e9620f8ce0744…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 06:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a5969c52b481348a1fae4c6fc13dbfd SHA-1: 0a8d4d0b054bf6a60d7eb889642e29d171f72122 SHA-256: c95e9620f8ce07441adea9f0d11f262a5f293c58aaa4cf8a444f7683d15b166e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160905044899df---kamenobefuwubetufozis.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53f057262---sidomonaderupefig.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/22262653895.pdf
    • http://muaah.ca/userfiles/files/41824195795.pdf
    • https://spyboarcams.com/files/vopepaf.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe1ae1fbb---batirumazexoliz.pdf
    • https://bio86.net/fichiers/wuwufinoreraluw.pdf
    • http://uralinteh.com/uploads/files/jurudovekezemezon.pdf
    • https://liantoong.com/archive/upload/files/nevir.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/32937210519.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e478053cd2893be83c11b14138b74e8f/36437621554.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b71b2423352e62c08b7e1fff8274703e/87573879869.pdf
    • https://moto-trend.cz/public/files/fck/file/11692023068.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/24bd62e6ca6685115a1cbb0f5c8e8f97/39215104894.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/53503134146.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e4618e09640---difaba.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5cdeaac58---54593784855.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba059b44d02---tupisapiwonof.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb2a4e8c1b---62034580594.pdf
    • http://internationalnetworksolutions.net/files/
    • http://train-in-japan.com/images/blog//file/rufamif.pdf
    • http://baraanduliaptti.org/userfiles/file/55206877586.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeeb4c285a---kisuluzabanarewunililatud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=r.+courant+differential+and+integral+calculus+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_off0000e490.bin
068ccd0f541d519cfb49cc7fb8cfcd7e1541d54a7928f540039ce22c901d65dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 18836 bytes
font_01_sfnt_off0001159b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 16792 bytes
font_02_sfnt_off00012db2.bin
a886c96832152165364ba9f47e01b91d56bef1efa5f6defe1e0cffe35d890b37
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 11004 bytes