Malicious PDF — malware analysis report

Static analysis result for SHA-256 298cd88f6ea9021e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 07:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54c04161525833b9840dfe3c090237cc SHA-1: b5a362fa23d7d9ed6da25dc00c0a62e1050cafb2 SHA-256: 298cd88f6ea9021ea6dce33d0c9b5972e27fcebd81f65b130097c96dfc11b164
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nenatubaxajefogelabupoge.pdf In PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/49739510433.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c570aa57f---ledetemu.pdfIn PDF document text
    • http://armanetti.com/images/kavusipenedagutiweredizuw.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/nofolodox.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/lufanopuvo.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/mipawedases.pdfIn PDF document text
    • https://ekransamara.ru/files/75252550214.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/mimabivalosekugupesafi.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/45977132205.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d52141ff1---38752913604.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda49a865d1---65724406574.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95d63a4f8---ginilalewarefezoropanivi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d74864ca9af18fef22e126895b9928d6/lenojekulinefabejugu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b2c4d28ad3d73a5103220e34dafc5ff4/47050130243.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mgbkeddhhkd3rbtf8pnql50156/nupenolabekuxosoziv.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/regesosipobutoni.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/jexufovazedami.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ff7905cfb25a6ce217e20a03d01001da/79406446941.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/bavotilusesezazonesegapej.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00e122c68---pujufafexajavasalipizad.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/93431391988.pdfIn PDF document text
    • http://adveotec.com/img/file/lizolonemidaduzexud.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/31796825695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=doctrine+and+covenants+student+manual+ldsPDF 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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10696 bytes
SHA-256: 38703527801fa20746e951bdef0162cc98ca42fbfdd7f83ba7faf6e0fb27b901
font_02_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 15616 bytes
SHA-256: feb31d8eef07eaea7a4e5962b6398b79d3ae05f224d596e021d57bcce543f108