Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39e8ed7099bf980…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 14:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a56ba5d20c58f45f443f1f3642606b3e SHA-1: 58fe3f92862523362189daa16162ff128ac32e53 SHA-256: c39e8ed7099bf980fd176943b2059a00588597b201af1017e41247c0d75dbb47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f4b04d32b119cbe75585c716a3dff2b5/sowozezimeluvagubu.pdf In PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/diwipi.pdfIn PDF document text
    • http://azizolace.cz/images/file/vugiwivumukurez.pdfIn PDF document text
    • http://osayit.com/images/file/69455239049.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6abb02ac---vaxasute.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/rikos.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/pivezabuxaboselupijudew.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/36477836628.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/xijod.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fc4rl5sa28dkg6e37878gi89s2/29056320375.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/49357304780.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/midilixigakawuz.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/jazozelasidiv.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5700c2aaf---88456485330.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb67eb4f1a---dimolipixadunevazuxiwesil.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/vizarulilegigo.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/jefed.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/27137101468.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/moxikonozejiwobi.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mugariga.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/fewodakorujasavusaxojuli.pdfIn PDF document text
    • https://alpinashop.bg/files/tiratesuzorezojeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+a+live+photo+my+lock+screenPDF 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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 14672 bytes
SHA-256: 2c34bf5624038809b132bbc633909b3e019d60d6a2cb0a184efc6386a79cddf8
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 10988 bytes
SHA-256: f60bbb44c42c146e0933c10298a92a3129dea6ba8ddeba083dfc9b050c06d892
font_02_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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