Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b64fabdeb218d77…

MALICIOUS

PDF

76.2 KB Created: 2021-10-13 11:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12515704f1e64729b80b2cadc94d573b SHA-1: d26f86511b7c3900dfa6b4b3ee85145a97a79540 SHA-256: 6b64fabdeb218d775d50017b36b0c8b38dda65e4c128803914c9687b9cbf5413
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not provide direct executable content, but rather redirect to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://belstroyiz.ru/img/file/xuduwokotidikomulak.pdf In PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/56537123662.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/bifumojusezajubi.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/xusarot.pdfIn PDF document text
    • https://mkontroll.hu/File/miwidutu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d1c4d0c3---nugibevoko.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/27250487215.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/45527451686.pdfIn PDF document text
    • http://mlead.net/images/e/file/19715379084.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/17782099264.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac0b8a6472f8870e1065ce68cbaae37f/jofolopojager.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/wolowigidejixul.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/40492113078.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/18262958800.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/82078361909.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/zotaxatamobawu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6h079on8u2gj6ihmqc04s0jh21/bidesavelade.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/19ad110f17e2547a5ec7943499a763b9/2528647682.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/linulixijisewason.pdfIn PDF document text
    • https://najemwroclaw.com/userfiles/file/67752294967.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/kaxeguzula.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/xovorixumawabonopudub.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/vuremabegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=boat+ed+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_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10244 bytes
SHA-256: 681cb5b4d42531d2a52aebd513c96e2076a02209deef1180273511e585ed1842
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 19960 bytes
SHA-256: 4549208d724c86f27ffc73d38e69445dff2b2d99fe55b8d3bce2ea2f93c4390d

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