Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80485c119e99eb0…

MALICIOUS

PDF

75.0 KB Created: 2021-09-28 21:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4500b6230840be85674d2968d9f710fd SHA-1: 07896e99dbd3236decb34dd57b36e5d86a133a14 SHA-256: c80485c119e99eb0876db712225211ce8828ecb110be433fa43a1bf01d8dba9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

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://boyanbolyarski.com/userfiles/file/zifijesewol.pdf In PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/72064406453.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/nesazisaxofawazol.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc5791a280---ziwuzewodovawu.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/sisibawov.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/41884077595.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/tobunutaf.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/27922751502.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/85109874303.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/54810499287.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a5eb438cd03143c476a80420c82bc8b8/malubemegokavujumik.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/50117738722.pdfIn PDF document text
    • https://dacola.com/upload/files/xefiwefoboxarudal.pdfIn PDF document text
    • http://master-br.ru/img/file/jikifaxilosalada.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/95653233304.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/wifanesipobelo.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/zumigu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614188fdada2e---20368491481.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f411a623f0---36862431326.pdfIn PDF document text
    • http://pololanna.com/user_img/files/fiziguvux.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/40036010887.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b7c969b3497feaa42e46e661d3122b9/76437856993.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/podonixufo.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/pedolej.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oj5d8n7gpqjleks6f12a1rq8eq/gepuwuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=drag+me+to+hell+streaming+vfPDF 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_off0000c028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC028 17540 bytes
SHA-256: a6c09cd65a0901670f1f4bb5919fdc26c46f837ab2d2bd6ccbca0943fd9cef37
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10728 bytes
SHA-256: 4aba9e295311fd32b1e7f50c383d26dbccd1eae4b53e6530000bbf86bec61740
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1