Malicious PDF — malware analysis report

Static analysis result for SHA-256 364a97413d9e3ac4…

MALICIOUS

PDF

99.3 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: 05ee2726b4d480e9d35a1d57676d0f3f SHA-1: 682c5793162852ca7dbe3b6ebdee337d05bcb139 SHA-256: 364a97413d9e3ac493a1f39a790f8312c2754eb79fe18ed15818555987f75153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa417575985---vunafewufuwuwavovezofa.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://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_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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