Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c15cf4d493cb27…

MALICIOUS

PDF

93.4 KB Created: 2021-07-23 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d5f0df357fe9596b349f122d76264a0 SHA-1: 9d10b12152bbd1fbb2f70f62a11b3f0d23d13ca5 SHA-256: 74c15cf4d493cb27ec51728a98188df79b1f9ca8e009c0a62b732278112622ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to other PDF files hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://topas.lt/userfiles/file/73324661927.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/42f14fa83eb9122c9cf0ce979fe384a5/domadaw.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a11ac392---57943303108.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zakirogenoninolib.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160db255cc0da6---xejuduzokopi.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/87329832087.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/41679295182.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/96825485627.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/xapazojewumogate.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zotesivilamipolafefiru.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68687424519.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9d69cf4b---4704758435.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s72qur48agh2smstg1o90g8jm0/wanovaxijenavaligalamapon.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4f9cb7a3---60833610344.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/54912845099.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/ribasomikosowowemisegolat.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7b04580fe063e9cb82481fe5cb765b79/8333121785.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/94047840218.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeb3501426---31388887203.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a071349818---wasepurawefomojofunoxo.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/filupogugejuk.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2d4a2d0b---fimezarekaju.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5d66deb5---96594264558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+wolf+of+wall+street+full+movie+in+hindi+google+docsPDF 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_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 17224 bytes
SHA-256: 8c1bff5e2f6d35e6017a5b0c7b57252a6909cc266a61eec65995555a9f884fbe
font_01_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA6 11136 bytes
SHA-256: ab1cea1e99ddbb086ddcffad2e758bf87be808f9fcd39b04a89ce10d4c01ab1d