Malicious PDF — malware analysis report

Static analysis result for SHA-256 25af2b113deb9bab…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 16:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 38dbe67e461b3931d87f94907a74a86d SHA-1: 62eae2153293db695bebe59095d92f2afebf93f1 SHA-256: 25af2b113deb9bab0a5ac9aa99cc76de37b31ce878c612a430ce4bc4f6db937d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=missing+funds+florida PDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9d38e343---giwiw.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13944b01f3cd270f504a4f200b4a30dc/mafijoti.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/83406764870.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655b7268d6---25674644924.pdfIn PDF document text
    • https://primer-spb.ru/files/files/9767404624.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/7374751162.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/19987639598.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/51848286781.pdfIn PDF document text
    • http://www.puhito.hu/uploads/rosajodikudapagepaxum.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/esgdup6tq08tfdrj3u2eji4sf0/57044871449.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8623d3acd---57704234049.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/87262420441.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fa860ba58e996b6871563b25d2ae8137/5475980952.pdfIn PDF document text
    • https://castel.ro/userfiles/file/vatobiwosagebufe.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/83765921205.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/dejaxomepijibupemaladiwi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0f073594---87534328401.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dtofn819pjmn82k3i149h3m671/mewigisegixesomazuda.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea0621ea8---9653170406.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/pawogojopo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/12a01701303cc1f4ff2359e8ed23b167/wulujapuladusi.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/59142051086.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/b0d8464a94d383e737623a0fae2e59df/nubalokib.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed24026e7---11832206318.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3561fc321c0555dc6cc17a2977fb58d/kurebo.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_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 18356 bytes
SHA-256: 458283f92a146c83e7a46a872fdd3419381a892f1e999b0711967fc30044d285
font_01_sfnt_off000137a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A8 10392 bytes
SHA-256: 08d2dc56b6583e5c27db306e1ff4a88b90ccc436e6b3d53d4f6c400f66f76750
font_02_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1