Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3ff429de5479af…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 02:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7123ef9d47a8dfcf1d538eec236aa07 SHA-1: 7bd3d47b2fd7e63e42408d53815590eb3bbb858f SHA-256: ab3ff429de5479afc0069a59441bcb185e1a2301bcfcc9ab802d468f05f285bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=windows+7+iso+file+free+download+for+pc PDF link annotation
    • http://agecarekorea.com/ckupload/files/befiferijifimovuroruzogu.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/goxeji.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/86019935136.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/8063472533.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vonuvoji.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/28327330289.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/15226931899.pdfIn PDF document text
    • https://ewt.cz/res/file/75288951719.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/63057271.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc993f370---17684212777.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/betajigo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd27d60d55---zediforadofekivunalomafi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db59f2dae---94438045699.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7fe2efe1ea0745a2374409bfd121a01e/37525791032.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/xitupojalenebulob.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/sarifalitudaso.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/81616544839.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/40039725933.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/50169332270.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/dowujuvagotidawujipigis.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/retelebeve.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/99148084981.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/ximanenigeniviwuvabibeda.pdfIn 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 10644 bytes
SHA-256: cc12290383e57dd4637e1f498a9469cfb2fb4743bc8b3674c01519a95d1dd95b
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16392 bytes
SHA-256: cbc4a6c7fbbcdabc57ad76ec2c020531aa869d508fcbd0530bc0107a29de99b7
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1