Malicious PDF — malware analysis report

Static analysis result for SHA-256 d704d3b8f5cafec7…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 10:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 720f407eba7c7d07bffe76a98334f3f6 SHA-1: b6c28bfd2327d9d8aec6cc6b20f70fa1df03c005 SHA-256: d704d3b8f5cafec7480849339306995ff3141925ebbb2f1226dd4298f0fcd2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations 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 malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://infrive.ru/uplcv?utm_term=adb+install+pc PDF link annotation
    • http://zoldjogsi.hu/uploads/files/94871781193.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/68779989727.pdfIn PDF document text
    • https://selispin.net/calisma2/files/uploads/72399367887.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07987c00f---77087424472.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd0ad0c135---74681932529.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/78704171498.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/12522593444.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/69164590511.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/jofumosunepafa.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zadarulujoripukisofebekat.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pizudezinimaxajekepe.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/75932266624.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/96787469865.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5167650559.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/bodobudo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/422dd50d155ac22f38cf2fd268078c12/80154761975.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/68658765842.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/96833011944.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091300564981.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/bosinexifiretofuguvafi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/92515407366.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/temuxenofif.pdfIn PDF document text
    • https://viettrungson.com/media/Files/45734125821.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/xoxuwowagoboseponi.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bekatuxukot.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e69e638e9a81b7afb7a7de5ebd1e4468/74040855710.pdfIn PDF document text
    • 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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 10276 bytes
SHA-256: dc3aff847f17a3957270b57a301d032a590028dce345a6439886a64919bad82e
font_01_sfnt_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 14696 bytes
SHA-256: 62e64054df9cb77085ba1e3dd66adeb1112d90e72cfddd9ab93b81c733bc9b4f