Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6dd7e8305be56e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 00:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86c9a1a77825a90e86957770d95df692 SHA-1: b5a3ab293e8c1d32eedeb228fd8229628a81e918 SHA-256: bd6dd7e8305be56ecad6b767b7ba8dc321f51cd6d587cfdad79d512e47c5fc6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jmvlpslimited.com/ci/userfiles/files/40857375381.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870dda10262---razunopiguxonofu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/784de419f51ff462e095363f79e34609/xotenopoxiwiluze.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/dadudekepus.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xariwizisefafa.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/80c3cag90u9i406bqlfa6uho9l/torur.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/tetedije.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a756ae9a6---runiluzikumo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///lafepisafavijag.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/p88g7uq0hqk6sv4l4uf16vc87s/lakulisil.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf0caab67---kulitubovowaragojajamugod.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/panodatudi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-12/20210612145117998096.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8dv6rjs634heb9oivm97s6dgfo/87475350546.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/kutuzibivegafenez.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_3CFA9BF29D9E5ED9.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/q3q901ociuo8u5104cand16q9a/34119113932.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/b57e1f3c0447518f7f67aea428a7c821/gebeta.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/bejemawubilebimolazukikag.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/40652088520.pdfIn PDF document text
    • https://mattress-leader.com/media/16836254541.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/66349434559.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098364a490ee---35491229888.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b6146781ac70db82a96f2343611ac987/18497700082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=singer+tradition+2250+manual+downloadPDF link annotation
    • 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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 11060 bytes
SHA-256: 1af5b2ef02e2c06c0913548ed4f1f18d29047db0271b8692e79d8f3bed3c0470
font_01_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 19236 bytes
SHA-256: 41093ca2524382e649b05f95008f6ca15ec0ce7b68103c998e60db1ca19ca103
font_02_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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