Malicious PDF — malware analysis report

Static analysis result for SHA-256 af38732a83f00658…

MALICIOUS

PDF

85.5 KB Created: 2021-07-30 22:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 837d4b384c8130eac6114b6f5a31cc25 SHA-1: b3ecac65b528f25e2e60ead13227f8bd694e29b3 SHA-256: af38732a83f0065860a621a8802239dcb06d280341ddba013f566946605ae4dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a tactic of using disposable or compromised hosting to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/01e99440a103fe5f37f62c5b1d125f2b/88648373355.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hen0paltuoj9q59kvvn2p32vjp/wiserofaralo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd96803e60.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05823d393f87748d6a2cad0f0a83c4d2/53120560098.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lazujovopozigajidivaximex.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/89756535873.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d191757bee7f739584562d08e0be67b0/39075999104.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b4bfb86a868c83293180656486f2f98a/90850115464.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/50619233280.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/zoxipet.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c600ab3ff641c2fac210e1cb8dba3234/30792657210.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4d92470e149fb5b95b89ee43a4a70190/petutozuxibeligezulovema.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/zosuwadafofe.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/zasafepulijuzefovuve.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ir2ddnvu8871othbehgmvai393/godip.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/68998813109.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c770cc156b0---65089732264.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/25d5b7a7a0eeb7198420d6e39daa9473/80220653781.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d0b5199202f3fa0bd49d82e449c62ed2/98000570752.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e9f5e755---zerilezabovojixivopi.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34338737530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=%D0%BC%D0%B5%D0%B6%D0%B4%D1%83%D0%BD%D0%B0%D1%80%D0%BE%D0%B4%D0%BD%D1%8B%D0%B9+%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B9+%D0%BA%D0%BE%D0%BD%D0%BA%D1%83%D1%80%D1%81-%D0%B8%D0%B3%D1%80%D0%B0+%D0%BA%D0%B5%D0%BD%D0%B3%D1%83%D1%80%D1%83+2+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BE%D1%82%D0%B2%D0%B5%D1%82%D1%8BPDF link annotation
    • 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 21524 bytes
SHA-256: 2c3622bc44759a2650888076b0850c456c5e915bc0489aaffad869fc72ae95c0
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 11420 bytes
SHA-256: 3854c936413565f739166aa79e0f8235b4e80125e5ead01582ed1f3b30b2652f
font_02_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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