Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a51cf4f825023ad…

MALICIOUS

PDF

97.1 KB Created: 2021-08-09 06:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 004a345e82ccaa9998f3ae6570fee0ee SHA-1: 6f851c60baac28315d02ae3b137ad2ac91fb4701 SHA-256: 5a51cf4f825023ad461b4e979ad27215821c7cad8e87cd28de621562efefc38d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ed2a5b04---82895634181.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8cd3eeb1c---mulefe.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/witebazepaxanobowa.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3639c78c---81646709651.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068fffa8729---tejumaf.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b534ae03f---zovawamel.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21db84087---60347092847.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/juwijarepobijobavo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/fojowufojolajajukazoxalo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160822488f12e2---sagagogazotet.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c740f88c01bff4d25a853dbd5cbc85da/13086643184.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sidogix.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/47921932428.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa417575985---vunafewufuwuwavovezofa.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786824cbc05---pazoxoxo.pdfIn PDF document text
    • http://abnicum.com/files/file/fevepefajonekakololexojo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1cbaaae7---79998619590.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/vevojebam.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/9tiqsj114f7qauk5dmcrv1slat/66128666044.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dbad9271f---ladixakapubi.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/panivofokiwu.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/64302404570.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/40053465024.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/6395407431.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/gofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=textos+mal+escritos+para+corregir+ortografiaPDF link annotation
    • 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_off00011b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B79 19084 bytes
SHA-256: 0c2eab6919ba33ee43034c4fd0a6636fb28c8dfeceba3d6dcf6621fb3d6cdd17
font_01_sfnt_off00014b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 10784 bytes
SHA-256: 2299632405d4c73eb492c8404f66b40701c319b698598e30be1e098ed53f9fc5
font_02_sfnt_off00016458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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