Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf10e7f8f8165256…

MALICIOUS

PDF

103.0 KB Created: 2021-06-29 23:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6846586917631415e6782b17c80fd216 SHA-1: 1b17ddf272a778bdfcb26b6e3d562a071dbf28e0 SHA-256: cf10e7f8f816525679e85ce978a4088c5481635ade898960bc8816f0bb64aa83
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating it's designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

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://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084b37732659---87108645690.pdf
    • http://taiwan-casters.com/userfiles/file/38085644760.pdf
    • http://afghansolar.com/userfiles/file/69753912433.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074b18cca4---voliw.pdf
    • https://partnyor.az/userfiles/file/gexeniwosuniwopibes.pdf
    • https://ivanda-commerce.hr/userfiles/file/peperoju.pdf
    • https://ctapigroup3.com/contents//files/25524872577.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848e2d2095b---dugugiruzujadoz.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/126cc02f954fcb2cbc0c56c294f8ef99/kumuredabolisalu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d7e50898---74163608297.pdf
    • http://masan315.net/board/imagefile/file/88313300923.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/updo744m8fac25ne3h8vl6crm5/mevawavu.pdf
    • http://bhttourist.com/upload/fckimagesfile/koxevusamujewebul.pdf
    • http://neodentpetrosino.it/userfiles/files/83992590722.pdf
    • http://beautifulmoda.com/userfiles/files/28737832516.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c302de43fc2---84762885584.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4f604bf9c81ca16c966c124cda4bcef7/negirugizorot.pdf
    • http://nfraccon.org/userfiles/file/26936010283.pdf
    • http://aven.su/userfiles/file/jozaradefopujolijawasa.pdf
    • https://laughteronlineuniversity.com/images/upload/files/64208510155.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a6methalqq9m0j14om9d408p8i/5708316106.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vector+addition+worksheet+answer+key
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e1e946cbbb571ee8ae6d81ed660e1df6/zoxojiwesifasujoduned.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_off00012b3d.bin
240b898ce8b51cdddbb90dfc53be22eb7a542e47a1c498d5c22ddd9cb417f69b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 19152 bytes
font_01_sfnt_off00015e28.bin
b857fd7dd2834b96191621657962840bcba6a3ced22bf33f8e69ea826a6746ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E28 10680 bytes
font_02_sfnt_off000176b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x176B5 16792 bytes