Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1dc2982fbf3e38…

MALICIOUS

PDF

86.5 KB Created: 2021-08-17 00:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cb6a662522571692eadd3d8b6d5b0f9 SHA-1: cde89df1bd3b27ccdca2a89ce9c10e8339b819d5 SHA-256: 4a1dc2982fbf3e380697c3301a6210f3a9a6755111571701b7711c6a66b19b98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://candleelectricals.com/uploaded_files/userfiles/files/50683568124.pdf In PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/welemibajaxuwanipulanalad.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/lijexabososesopojuto.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/21996484758.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vulaxi.pdfIn PDF document text
    • http://landia-print.com/pdir/file/vabapabubujuzot.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/36373296246.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/pafevagezobig.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7f7ddcc29eec03e66c9b8af67a1ca1a1/fidagalirunijota.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/jukugejotabegokezerajofim.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7e6b33a---45669071780.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c76ae48680da359156cdb4451762e992/23682616545.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/jobudowotodifujagi.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/5022155151.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae719eb91f7---71856065608.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608478c2049c2---lugunigoleverurasuvu.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/fuxifabo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cc6e9c5fbd7983fb45a36468108d757f/fuzanavewowajenetedosifi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bab9d4cf---xivagiter.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/kesumowimuxamejipugosoxo.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/zuxisijazibolozuzed.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/20gte2i8lvuvlrf5lqnft8apkh/novosovarax.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jiwefuzobofitim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=maritime+lawyer+jobs+in+indiaPDF link annotation
    • https://bit.ly/3fNwBosIn 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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 17420 bytes
SHA-256: 2be7f095729bb03e08a67c4496921188e1eb404aacb1d1e1e258745cf6ead0f7
font_01_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 10872 bytes
SHA-256: 410de142701ae4d0f58e39c3662384a94cb125b34315cf6a704a21f8b7329081
font_02_sfnt_off000133c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1