Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9c18ccae44a6f9…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 04:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45cf3a8ff4fb28e2ac0e6823f80ce5cf SHA-1: 405d980e2f0bcd14ff55ea2db63c70ed82a02de8 SHA-256: 0d9c18ccae44a6f98879339f29f564492ff7174e99ed3cee7ed884a9dd584661
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms on potentially compromised CMS uploads suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://synerhu.ru/uplcv?utm_term=geographies+of+postcolonialism PDF link annotation
    • http://cosmik-kinoteatr.ru/sadm_files/73868833341.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/polumizetosutilesulur.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/7757455089.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/nikobupajodod.pdfIn PDF document text
    • http://labradory.pl/file/84857415240.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/lekilele.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae26d96532---gulunuk.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/jakijezimuk.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/30798551994.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/46979858290.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/37342560736.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161558d1838cbf---77445457939.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/63380920663.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/vufiguxesumolakar.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/34316861238.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pudigogokafetedavorap.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/845909167.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pupibakenigamugefuwos.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/30900653697.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/widomulipa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/81e74528303545d170ae2e75332b0c52/gelipigubikexiwenopugus.pdfIn PDF document text
    • https://jotelek.hu/files/file/vodezadinipigikekob.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 10968 bytes
SHA-256: b145a9092bcad7f9de726f1f0ee1db196706a5fd7ed85c59dc1ef554e374d680
font_01_sfnt_off0000c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 15032 bytes
SHA-256: 5ead2e8d33a6eacc7a9b5b1667bd666042c18a50708d793eb4d682b5c69be3c1
font_02_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1