Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0506d37057a065…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 07:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a55207a1c9f62ec83099918a0be6ddd8 SHA-1: ff2eeeb7dfa6229d5e312ad4e5d3ce537efb294e SHA-256: bc0506d37057a065e745ca01539d2984b85e75a515b7751b148c41adc3424374
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate that the document's primary purpose is to act as a link farm, directing users to potentially compromised or malicious websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dialogueinpraxis.net/files/docs/177527287.pdf
    • http://geologicatoscana.eu/userfiles/files/71918539843.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adca5f0a087---46447212866.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc545f459a1---kidefixum.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849a01b8915---91320741759.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088f27c7e5f0---pexunezalanibajivuzasaxo.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4c727276---minosizadeko.pdf
    • https://ovalpolycoats.com/media/libeduwonimijofiw.pdf
    • http://101-games.ru/images/uploads/files/24870461189.pdf
    • http://younewstoday.com/task/userimages/file/25972528959.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0beaabc959b71b5528d3a5d28c1802a/80115184626.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/34f541b53e110dc00057db2d658f8e6b/kilaviripimu.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5eda2663---vanubukikeg.pdf
    • https://juvelyrikoscentras.lt/Files/file/mopipurirabilufumesaval.pdf
    • http://kowel.com/ckfinder/userfiles/files/1623373714.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4ba262878644bf41dcc05d60390d0d5c/90652856069.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98a03d5c935a819734c746cfaeb57213/zikajusabof.pdf
    • https://securityguardsupply.org/php/uploads/file/luwanamexenozaxazesak.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d1a1eecc---dowenutabedumewan.pdf
    • https://footballsod.com/images/ck-uploads/files/daris.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69de5da898---raves.pdf
    • http://drsuthichai.com/userfiles/files/70482280420.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+horse+dealer%27s+daughter+analysis
    • 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_off0000e9c3.bin
197d3b79ae64d0ad475cf3e7ebe727ea4ad56b8bcfa1582748b07495ce192aa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 16124 bytes
font_01_sfnt_off00011340.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 16792 bytes
font_02_sfnt_off00012b57.bin
e16c9b14028e0f3a7257e7b007376f45283d48fb7dc21525508562de337347e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 10740 bytes