Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f27017af8408432…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 00:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5fbb1cb541d81cdfd38144ee0997bf3 SHA-1: 5cdd4315a4b289e095b18a8d6781bd5dfe6999e4 SHA-256: 9f27017af84084328f95e24e73400b024aa40f24d353fe8fcb47261d810344de
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to lure users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://network-italia.it/file/17287927700.pdf In PDF document text
    • http://aven.su/userfiles/file/runitajarukogoxam.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/dakudebodetudo.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/41525576264.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/73828067239.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/wurifamubededada.pdfIn PDF document text
    • http://bronia.org/userfiles/file/98525530062.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131c603979c0---rowufevemi.pdfIn PDF document text
    • https://protrialse.eu/files/files/kivebemaginetuw.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/revasowanofuwakivujo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/vemagosituvem.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/85910853841.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/8760773442.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9uh3md9664jsao1918p19cc06d/bajoxerolu.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tofitesenede.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/fikuxixidenusinisivuwegal.pdfIn PDF document text
    • http://wych123.com/upload/files/fatikonexataxo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q6ho6qvh885qt9svv3gv0d8eb1/19870582553.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/58794730462.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/14692697101.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/dc528254db84d9acd992374d3e7747ea/livizofezuzives.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/94616456758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=email+markup+languagePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/rulovodakinuganitaki.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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16272 bytes
SHA-256: a8d5697ef01f74c3ba7bc23b70ae3b114cda6a3e0171ee6b047672991da19137
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16456 bytes
SHA-256: a1b934ded1e8d3c1cdc8d4c7fd423d7ffefc6be1e1d3fe6f5f8439be7036ce6a
font_02_sfnt_off0001313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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