Malicious PDF — malware analysis report

Static analysis result for SHA-256 b079f2d40ee514a9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 22:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be0e9d2b7826fb8362c4d4bda6ff95d1 SHA-1: 72b7b32604b2c3dbde140fc86669b27c5766ec35 SHA-256: b079f2d40ee514a999430caf079f73f8a2f14ab782178a5525cdc65b7953b78e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of 'invoice' and 'payment' related terms in the extracted metadata, combined with the 'password-protected archive lure' heuristic, indicates a likely pretext for tricking users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fafe2be0a28---lisozakoxodabawufirus.pdf In PDF document text
    • http://suachuaspa.com/upload/images-content/files/37337949674.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1c61okkdl6tdoc5644572m6tvd/xogeg.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/8c82ohi854uv3r1u1roeuo18fs/toxobi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jmdrn976a5shts6nr5ebh592o2/kudugofobinofapajetoxeve.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/xelomokagelopatus.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/mobirozi.pdfIn PDF document text
    • https://uudanbury.life/files/file/bafunabuxifivominusefux.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jixop.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/dakuzomunijipegur.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wikobenuneraliluniwud.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/peniterapapipejizetawijew.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zuwiwi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fupopiden.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/jiwebivavebadupagimo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759610c9312---zelomezadovifisajajuvot.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/zoraborawifowirisuku.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/de8c694afb550021212c5817f1a2f3fa/rasomipirugoduj.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/61687414867.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b1efc2c6d---zesobow.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zupiwimetu.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/xubezusuvivepupekifefoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tally+erp+9+inventory+vouchers+entry+pdfPDF 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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 11128 bytes
SHA-256: 6e15c43f4bd72668df47139d2d381fc6f190cb8f4d0b91c4f78de314831b76b9
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 17688 bytes
SHA-256: a10826f282fd3051ef0540f1d1ac92f71737a490200586f54a14b16d55813704
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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