Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50c6554989de163…

MALICIOUS

PDF

90.9 KB Created: 2021-07-13 07:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b918b0b769f6db4a58a2551afd6c412 SHA-1: 3ea7d96e7738248825d63c35c72f2fdd4e80e223 SHA-256: b50c6554989de163751555d11b76f7143c511f9a6a9f88ea962957653915066d
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. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/84f6c09f7fb807b3c66ae7e2150d01c6/77162966435.pdf In PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/680b0a2533fa3ed40184a15750336a08/83056688109.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/40843501857.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/69a9217942809cf94e1dade17d74390a/99481170139.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f11254225---defujabusezidoxaguk.pdfIn PDF document text
    • http://www.bash.cl/media/file/rasisokemu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/74ff9bdaf6bad9624e7409ef8dba5624/turikofizojiwito.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcde899a27---jobijazaworuzewilofefo.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xopipefusa.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/19402033214.pdfIn PDF document text
    • http://teraval.cz/res/file/27535943563.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608362531382c---jezivapa.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/57379511634.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/koxow.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1672b6d30---bojumu.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/dolaxakatuzi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/27406152055.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0afdb5e3---25970995917.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/54729720175.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/67710718154.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/93197195001.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f545a184642b1c48c77655288c8ee740/tavusexoripunofur.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d0314e862a7---34998299107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=quetions+and+answersPDF 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_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 19296 bytes
SHA-256: 920477e32533bd0af556423ec2a87f806148d6b563abb03e50dd0316bfeb80d6
font_01_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 10440 bytes
SHA-256: d13a02987d5a23dd17a15ae328744bfe677d4439746d5daa7187d46336ba3236
font_02_sfnt_off000146a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1