Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00711af38280c6a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 14:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66b1eb9594db1e60206b1be3d75a5ca2 SHA-1: 43ac3fcf96b95bfaea3c1c2f281cda4898b575e5 SHA-256: c00711af38280c6ac88e5b551632480b4bd909916ef0b9bdd6b351afda60085e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tpkkjjvhvvuiq4n5rbmsack6fh/jebubodokuzozujesoz.pdf In PDF document text
    • http://sirindhorn.net/upload/File/4735533253.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/8892733014.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/93666506039.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/vasadazedumegelovibabus.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/19271148023.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3f646ab6b757acc41298bad22f14cb2e/buwisuvaguxatoxika.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/25871953247.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/29891131909.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xugiwixomupewiretigamejiz.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/rosadetine.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/812839e35caa6b7807ea5db84f0ed739/revowufawej.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/xiboturiraboseva.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/fotetibopatibusa.pdfIn PDF document text
    • https://curvy.tw/upload/files/96294337162.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/lidod.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/13847215890.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/sodakiba.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/1132485662.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18920722980.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/33690197692.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/rinobojikinikabozojino.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/80744549161.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/32802231717.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99867553516.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/31157814759.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/71713199860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tomb+run+3PDF 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_off0000c73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73E 9948 bytes
SHA-256: 56385cdf0ac303c08fbe56f8892015ef296afeb094b28cdf45ad44ca7c350431
font_01_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 18972 bytes
SHA-256: 2f71c6701da4c93d09889864d50bbab9c51eb10bdb405caa618140381fcefbea