Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d83c80b4dcef57…

MALICIOUS

PDF

92.3 KB Created: 2021-07-20 21:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e73aeec2634c01cfb37aebfefbad71f1 SHA-1: dda7b8f9b75681fc192910576a4d3ae35f9f0ff0 SHA-256: 06d83c80b4dcef578989dd455beff44930004f4ebca283e2beaad131e584397b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160de2b39a02a6---kokige.pdf In PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gefavaxadi.pdfIn PDF document text
    • http://ledins.lv/cms/file/zapokusox.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/38853488247.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/dunajufodumawan.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/wikedefa.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/64789560989.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/orugn4ogso8vrfdve35k1j3jg7/60752057094.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6bcebc1902fef06771e88674fab0c6f7/6039485024.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/junitomisibigalefufona.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/91454839126.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/pabipije.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee3ad382cfbcfd300fab6c40dfb7a0f8/73630892021.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/rexipupafuvigozilujupa.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tonuk.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/0bcrr0ud233qhbddib85gj77pi/zivatuguwilazepotokomitem.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/wufoxirus.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wosos.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080af4220358---budafazuz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216631364---gosufuna.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba411e69a---75936058475.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/sejokidiruxawegapixogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chyluria+treatment+at+homePDF 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_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 10448 bytes
SHA-256: 621460e7cb8ad5c149320a5cfb480e4ce2a645df0635c2ac6bb84ecef54d3ce4
font_01_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 17172 bytes
SHA-256: 6f6e5445ab703a539519454722bc612b1ec0ef4ecd15f36a49144cdb38fde22b
font_02_sfnt_off00014c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1