Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea3bf40526e309a…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 03:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39cf41e27d677257029ab66b4a8104d3 SHA-1: 39f1eb25ebc99368b02a34a8955d62a13b090c4f SHA-256: fea3bf40526e309a4b4109c29d65175a08678307e36c1b4383966b559bc60b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=teenager+and+parents
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09179710ed---tuzamat.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/62116354532.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5f2aa505254bcfad25900268e29ac121/gulenalafogezoba.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf048111bfb---nisevofi.pdf
    • http://vejwun.cz/images/40997086969.pdf
    • http://targhevaticane.it/userfiles/files/fexivunadoxud.pdf
    • https://alamansyria.com/userfiles/file/371952159.pdf
    • http://sam-global.info/files/file/pebew.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/addd9febb9a7fb6fd3767abb61437464/fadosadizijekizezavatosu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69fa1e289f---sexaganidumunebir.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3558662629145f96cb60f2652f88a84d/padom.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a04eecdc2---wapexamipukabefipob.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c509aa63067---4375743758.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fijh7ocoisb041g2hdkidtcdn0/nofobavivutos.pdf
    • http://aihyang.com/userfiles/file/jebavoso.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7165ec68cd5b970d31d8ace86a3e06e4/98426877608.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/982f77c8ec3b3c071c17d6a9be62ee12/zimomifuxanidima.pdf
    • https://isosklo.cz/uploads/78603730944.pdf
    • http://wittlich-luexem.de/userfiles/file/levidedezaganeluve.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/nuvolujexamotibejisipuva.pdf
    • http://limoride.net/gallery/file/kozizimibufod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6b.bin
bccee8201ef163c4cf7f17cf5223c30f0c91fc916b2b4dd4ad6c719f8d740c29
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16904 bytes
font_01_sfnt_off00011829.bin
96ad69d9d553b953e0330524ed81d443fb0cb63c49390cd3b408d92d16840965
pdf-font-stream PDF embedded font (sfnt) at offset 0x11829 10272 bytes
font_02_sfnt_off00012f2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16792 bytes