Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a73bccd93e1e80…

MALICIOUS

PDF

100.0 KB Created: 2021-07-03 10:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6299494ea0b440b2cf4d00a8c907c35 SHA-1: 181e7f4d1c2919695e59f0e812d0673586d87bf4 SHA-256: 67a73bccd93e1e807f201819c65fa85d80b80ed2cbce2e5de641a3a9e8d4d950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://eseninternational.com/uploads/files/38424564578.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a0a5f0abb6930335818490668ba326ee/633680601.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/21747322890.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jqgqpno7ksbgumbng859u40k50/kefawevuzivujamag.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zamibokexivatifexiki.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609781b8010a8---didenepavadorem.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/zijokudapolifabifaxa.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/22a7e31cf014908de1e4b48b847eca2c/57209634953.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7c675d12---melusifeto.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/powitogukurupodokasa.pdfIn PDF document text
    • https://2acontractor.it/images/file/fubake.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160985dd551b3b---77335677753.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/534a20baa28e0161fc7434b03babdc22/xetewopofamixeja.pdfIn PDF document text
    • https://andrejc.si/files/file/naloxexefomogaxube.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b9c29059---pagokawojumuminebasazaxod.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/sisuwotedafalekijik.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9f238c57---11017035636.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/qlbnjfuk2iask5cp6sisrlps14/xipimuzidogofoxubi.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/memaw.pdfIn PDF document text
    • https://everestart.com/images/stories/file/76864081205.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/12qb38lo47dkjvg0q9cmebikkj/kijosizuti.pdfIn PDF document text
    • http://immopolignano.lu/images/runuz.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/88124145204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=accidental+parasite+examplePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608474db4ae73---defebipebewowunofozas.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_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 17304 bytes
SHA-256: b2dbe0ec7e8240eb1f7264391a8e859ecdbad6c70e68b1f112e054a5db3b3943
font_01_sfnt_off000150cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CD 10640 bytes
SHA-256: 5ec55d7eecc96a2191ad578d378014aaa33c11907ad6bd5ef8875d44652c7c04
font_02_sfnt_off0001692e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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