Malicious PDF — malware analysis report

Static analysis result for SHA-256 79512c7897b5ea6f…

MALICIOUS

PDF

104.8 KB Created: 2021-07-06 11:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e7e5d8bfbaa8b245e4730ae9c655938 SHA-1: 85645c162cb60faf81f70c851f234a850b3135ae SHA-256: 79512c7897b5ea6f66e5e3c079784e9a9580bf7ea2397ac8a8411245b6fa2595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://smidgel.ru/uplcv?utm_term=rudolph+the+red+nosed+reindeer+song+dean+martin PDF link annotation
    • https://hoangnhataudio.vn/media/files/31321375684.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/anoln0nam2to352a353e6t8n17/liweravu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9942e5b55---70495335911.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/67069635927.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ac6c4693---vogonusuwipagowa.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/zaxibewekivuwipidip.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f55376fb---90011462810.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3efa7beaf---rimusipamemezifolinovumi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bfb6e0ba6864ac64a380cfede4c70988/75918136563.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/85870745478.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/070f0fd4c5c2a01a7209587be9bff3e1/8808442078.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7e89749e---62951279789.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/50855838827.pdfIn PDF document text
    • https://actorconseil.com/files/file/58906764183.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tilabinufolirufipogiwaki.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/66627707599.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/beccb6da07b0a506e4eebebf02d1aaa6/duditetuwujunapogakonijav.pdfIn PDF document text
    • http://intergeored.com/upload/File/zalelamajagowuxixiwu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gewikuzizudozakalumet.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c614f81b187---kalijevofiliput.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/qlgjpsj2fvvv271i133o54evl4/8803883009.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/norosopadogaxoj.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/vepexo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000150c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x150C9 16644 bytes
SHA-256: ee0f7fbba1acc2885810cb6758e5c55a12fb98941ec2bd8d3553e447e6b354a7
font_00_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 10984 bytes
SHA-256: 4930e32c609c580d19eec4e7e9ba4a3040aaf4c04f954ea451669573837674a5
font_01_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16831 17228 bytes
SHA-256: 07604acbe3ca379769610cbb166c8429210179f3dd99412eacc54220d8543d76

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