Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ad06d68c0d82f3…

MALICIOUS

PDF

83.1 KB Created: 2021-08-18 08:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8c8aa47b08704cdd82be7020d9e2558 SHA-1: 6374fca756fb43f8fea6fa4caaf5ba3d2452be7f SHA-256: 22ad06d68c0d82f3b5a0298461be8b64b1071fce01447af7bba8d26f12a7a1ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These URLs are likely used to host further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=handy+stitch+handheld+sewing+machine+instructions PDF link annotation
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/27f8d28b18d0bd4554ab77d131663343/xolopotafutozuk.pdfIn PDF document text
    • http://osayit.com/images/file/galaxiwovubejidomeviwidu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/78929585124.pdfIn PDF document text
    • https://atl-50.com/files/file/kebimirov.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/laputuniw.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b5l2pcmmgsd4s4af4ss6in7jq0/65495209007.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/27842182045.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fufakizagebijali.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6f9822f8b153325f9b77f4349f32520e/45062452501.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-18-03-25-12-44.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/80204449563.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e4fda6bdcbc7dc603c853e2621473041/pigisabozinoramonazikusa.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/21307307957.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/80457155985.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897330b3509---81567088959.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dcc075f4---19266222760.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792537601cf---naxix.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/17992090165.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rageborow.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/b743bj6239m04vle85hcsq15m6/56082813687.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/fe7c13a81b7af0cf948876330a5862ee/vezojo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/23432711796.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/707b72f87a6e3bdc973f9748df96b68d/24751462918.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/aa03ecca703ae0e64be3d9780862d042/nugibinolewalizanurives.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/lumitojizidafit.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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 16364 bytes
SHA-256: dbe547bc587091795de1493d8db4669b0038be088bd9111bb5aaf595ba001d6b
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11108 bytes
SHA-256: b1eb059e2eeaf56126faf4f988c3d8f96b1240ee60185f30eaa139543e3dff0d
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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