Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5703c0ac97d43f…

MALICIOUS

PDF

87.9 KB Created: 2021-10-11 22:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 282eb5ac4a899ff76387fc41425f2c5e SHA-1: 7fdd5b83c3d1d9449284ec90686850a958a61558 SHA-256: 6d5703c0ac97d43f77f0e0ceaa26897407bceb48705eb163b369e03bd287aa18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to trick users into visiting compromised sites.

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://equipelec.fr/ckfinder/userfiles/files/tanisijolejifupekekemepol.pdf In PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20211002_174825.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/89201228820.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/ritizibezugatijakekuv.pdfIn PDF document text
    • https://la-klamm.org/Files/files/80907780011.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nejotobemopexol.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/gizegosif.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/bosokijalogarinubuno.pdfIn PDF document text
    • https://magerp.org/upload/files/taxejowoxatalujetuvija.pdfIn PDF document text
    • http://yilip.net/userData/board/file/60177361947.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/pedemofakilaka.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/58222159885.pdfIn PDF document text
    • https://tierlistei.ch/downloads/nomexelupivobezovowof.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/vevuzafu.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kijoj.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/bewutipuwifusep.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/visewalulaboro.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/120271ceabeb9c5ed938257b3d2a479d/dajuvunuvuba.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/22590197225.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/22271389363.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16156ea06c50e4---63071587505.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4b3f24a6f02a5432903a10c54569cf13/46800555044.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/80087581325.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/turekiwojevidozidevovade.pdfIn PDF document text
    • https://gebzecelik.com/userfiles/file/zipoxomar.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=laryngeal+cartilage+calcificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10412 bytes
SHA-256: 6a704fbbb54cb9c83e30e28760037ff7854960edb8906cbd0352588fb1b599b7
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 18948 bytes
SHA-256: a0769eb316ee3c2e187d7c8b5a7b48c92f827f4c567e0303ed403c06a142aedd

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