Malicious PDF — malware analysis report

Static analysis result for SHA-256 a199c0d87e013fea…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 15:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb45eaf71fa8b77d84caee7b3677b82b SHA-1: dd7e0a0937950c2dbc7d7ad07b6fb3c9ae407846 SHA-256: a199c0d87e013fea75c98454bad2f19ce2151f050fa920c2bee92b31504450e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bahtiyardishekimi.com/fckfiles/file/gebifuj.pdf
    • http://www.dilipprabhavalkar.com/images/file/78377325290.pdf
    • https://vicotelecom.vn/static/source/images/file/91380839423.pdf
    • http://paitoonbox.com/userfiles/files/zibejepowasesosafapa.pdf
    • http://mnwebdesign.dk/userfiles/file/godos.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c222384b6---wisiwajugiwedenonakefabot.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1580452857c3efb7aaf03eccc4cdb4af/palojoselimowepujivarax.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609252c4d8db9---sajevozitogekudizibe.pdf
    • https://calendarsunrooms.com/userfiles/files/30947553949.pdf
    • http://wawa757.com/uploads/files/53367685046.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceab4256e5---gogepe.pdf
    • https://wecareu.net/ckfinder/userfiles/files/pigegogowepuzetamajid.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/21ms4jjm4ohq9fk1o4ueuspf0d/sigaket.pdf
    • http://uptownherndon.com/uploads/files/1039307037.pdf
    • http://bora.su/ckfinder/userfiles/files/13976182088.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6ea77437eb8db9f974ea670d24b6e95a/lokofomebaxavujefojimate.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b32cfc0635e---65704586423.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d9eb7d82---21793747898.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nipolukotulufabodejeb.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1c53187ad4b60f882c0d15e6c206b7cb/zikazefina.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abe5da397---34505153527.pdf
    • http://bona-agra.pl/Upload/file/19095172552.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/k4ujepvo8de5ovcafgi1te2d86/ziguxirizosulosipijen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=colangitis+biliar+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_off0000f51a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 16792 bytes
font_01_sfnt_off00010d31.bin
63955e1c43bc2f5054a1d2ea8d3994a92be0763399964d729b2a88b9844b553d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10712 bytes
font_02_sfnt_off00012578.bin
b314acbd5c6873a744cedbab4f4b7b4adccf195335216e41d541564c6dfa26f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 19540 bytes