Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6688c1576a7fe94…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 15:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9543974957951ba51174f2209127e280 SHA-1: 52e86b4776cf26de0473b3c011a39733e217e104 SHA-256: d6688c1576a7fe943f101842272524f323305e569a66c4881acc711ab36b14ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and URL patterns suggest it's designed to lure users to external malicious content, likely exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/tolepubefutubif.pdf In PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/kekivelitowolojofadoje.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16100ef09f39d9---jigalo.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/kodalam.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/74807129960.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5fa1f53a---1554643914.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/480837835762bbf27efb9e644400a78a/40391917783.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/877c14ffd459caa532a0a28654ddfbb9/3654981643.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vuxisovot.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/bupisazemaladubezirin.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/29087919219.pdfIn PDF document text
    • https://hgb.se/filer/file/34384560124.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/81992203409.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2e749a9e7c2d403500e477742a087ccc/4305960801.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/28388779415.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/89222662611.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/92987801474.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6632293e664a75db034dc2f2b46853ed/36657189681.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/79166368082.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108140242202214.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feffb419fa---pover.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/26453688949.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3t7c3runn0o5s98h6lvcaca64/41149705344.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bujexerojimamojadojuno.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/35684441887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=obst+und+gem%C3%BCse+f%C3%BCr+hunde+liste+pdfPDF 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_off0000bbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF3 17640 bytes
SHA-256: fc287131b3db3a8d6c88be2d56a7e512fe624d360b25ca2e6bf92c8fc2270cba
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 11120 bytes
SHA-256: 94c77bf0647069654a7d947deef2cd20c0dff046dd4c72a2a7687195fa84557b
font_02_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1