Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3ed6219b418b2c…

MALICIOUS

PDF

86.4 KB Created: 2021-08-13 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71a21963f52309372df7b4241838e8aa SHA-1: 234bec3ed517149a25f2317446d0180f38b3c54f SHA-256: 8b3ed6219b418b2c82542340b680df06e1700a3d5c440503461c0b27794b62e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly suggest this file is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=mr+bean+1997+movie+watch+online PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e18d9b73---berinesuvubaxiwemesuwim.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79a4f2b7f---mawupu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/koho0irrm7iujt369b3qt12rm1/lirufuz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/051b711b5ae06d3e1de40c87a07360b8/wulugexag.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/68446676007.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/zelagodolirubagokuxuxet.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/goxilojosokironakuvira.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4256812e4---mogux.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/4018551235.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918d178b5f0---mofuwakolijepupupiki.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fcd6f49cf9aebe9788c20fe443e73cc2/81128289957.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/48986709273.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/gamexepixipevewuganinuz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/rnsqubcmvb86rishkl6f3s7vm7/liwixapefilawupufipa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/jumazajanitosam.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d55be87b---66662977517.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e968828998---zoletowugosodefen.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9c8e76b8---73224221230.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/784636626.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/95087393174.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abbce76e0---kumakidufoxusakijuja.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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 17188 bytes
SHA-256: 904c87b0a379d45f1cd96f3afc411c4b0a001b67ea570a5a1a7dbc766e263226
font_01_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10884 bytes
SHA-256: eda139a36479b4a527b51663936f662e17c8fe6f7298f8d955d0452e75efecf4
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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