Malicious PDF — malware analysis report

Static analysis result for SHA-256 c316bc74e752fff1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 01:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c72da6ce758b8475f3ab5c4fba64a4f5 SHA-1: 6231c8576ce6d3211d630bc7477f98a4204cc6c2 SHA-256: c316bc74e752fff15f2f3bc09ebe7e51871dd64a05253800b5d7a635aaa8432a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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 https://philabc.ru/uplcv?utm_term=how+to+unfreeze+your+android+phone
    • http://sys-svinding.dk/userfiles/file/6560707216.pdf
    • http://impressivetravelvietnam.com/upload/files/65305896103.pdf
    • https://ceccargiurgiu.ro/userfiles/file/wilidemeto.pdf
    • http://eastcoastbiker.de/sites/default/files/file/69516794856.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/fezivuguje.pdf
    • http://cbcom.fr/ressource/site-image/files/89304235371.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/mejuxaxamoxijine.pdf
    • http://alarcon-v.com/editor_upload_image/file/kuvusenakev.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/17954451647.pdf
    • https://ptkas.com/kingkong/userfiles/files/90672511441.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/30363777069.pdf
    • http://d2dgroup.net/upload/files/9086518216.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e4c6bdfb---ratobakapixofolibenu.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e9421e5e---53108927971.pdf
    • https://imihwa.com/uploads/image/20210910/files/20210910050723.pdf
    • https://cezartravel.hu/userfiles/file/58883095679.pdf
    • https://limsurempat.com/contents/files/losovisanekizaj.pdf
    • http://ztkammer.at/uploads/file/tuwavikejojugefowosiz.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/64397374742.pdf
    • https://eledigitalpr.it/allegati/file/xusoxuxugefomoboze.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/purefovimadagetofotuv.pdf
    • http://khautrangkhangviet.com/upload/img/files/78746935723.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/muruxedurizabarubiluwur.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec46916e0e---sukurigilapozekexiluli.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398be907699---vozijexifupivi.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_off0000dd86.bin
118dc45266af1de5dcc85db7386937848371cdf8b9eb65ac35d592f440667b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 10732 bytes
font_01_sfnt_off0000f62d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
font_02_sfnt_off00010e3f.bin
3b25b57490f8cd456c5e6c2f6558c8fa96e2f52df50c1cb885224a596d7aafbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 18156 bytes