Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0fdef3eeec7214…

MALICIOUS

PDF

98.9 KB Created: 2021-08-10 11:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: baffb0eaf1b66b3043c0dbf4b1bf3c97 SHA-1: bfc4e5960bbd34055393d9bdb8d0ac2d7d1e0dcc SHA-256: 5c0fdef3eeec7214550a661dbb6360cef2f1179d0989c25ff672a7bae6ee1246
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://communeouchamps.fr/userfiles/file/25076427655.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/dc693a3a80b56dc821df508fd3b5b4d8/fatad.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/af80825bbcb1e1e4dbe78c75dc1a5373/wubebip.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525100157891075.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/30e8d6bbf830665f04ace2e647a5f41d/fijanapuxijezogebiforigu.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/laxetowimijomib.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/40382070327.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/fajofobuxiwawel.pdfIn PDF document text
    • https://cncunse.com/d/files/81565070304.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/18481486108.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d78ec3d8f---15009847815.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c53d11870a---niwan.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210706_203834_195.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e98b0bb0---57592733126.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ba0bf3a12ee9b501250c490a9d16743f/tujisipuxex.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dodorofujojinizan.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/fupumipejivodoranabaxuxu.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/68303608024.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/89263717294.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0df35480f---41839884912.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/wazadaturenexojelemaradux.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/digijilabifejimitu.pdfIn PDF document text
    • http://podarox.ru/public/files/kawaru.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gojilitamuta.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/81635404047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=deep+focus+shot+citizen+kanePDF 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_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 17900 bytes
SHA-256: 70d2106fb1663d60069f6c70e9cabbdef26915abedc0d48368702b9ec4707856
font_01_sfnt_off00014bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163ED 10684 bytes
SHA-256: 19fcd73250b1abec22fd163265fa581855c97658ac393a931a2dfe5207aec972