Malicious PDF — malware analysis report

Static analysis result for SHA-256 c176f4145905288e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 21:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b01694c78b3017e10cb6435ec79db51 SHA-1: 42aa3ad2b7455c5849648953d96c4d2638301148 SHA-256: c176f4145905288e9438890b4d98859b6f0f244112d235c0afefae47bf1fc67a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The presence of multiple link farms suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yalcinsezer.com/upload/ckfinder/files/panamiliz.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc8afbee88---gubolabupiwuvavidogute.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/tuvexabeduvatirulowatudaz.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/73e782f9ee5c74dbeda81ab15d01698c/mimawapakor.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rifesurewavogisozolexef.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/82898140190.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730282583c4---vegosil.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/zukomexapozibuvez.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/62375349006.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610565675e69f---50410459125.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8c490a7b---42248179745.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7vusmrcj92eu1lu2hk4bgke8t5/10628749582.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/71489facf40ebef4286a7d6b6f2d5ed8/41976513705.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5d59a527---89825461178.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/fotamimelijibegad.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/8272638741.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bonovago.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/jawitiwogojenezezit.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/pulamelemed.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rutiferamemegoxozizipogeb.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/nevimanevukavorojidav.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/804e31a9c55c327669428d3c4a5eb36c/midewefiro.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/51072427756.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/55185057753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ingersoll+rand+air+compressor+repair+manualPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/56445645980.pdfIn PDF document text
    • 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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 17504 bytes
SHA-256: 14ad5a0a504986ca818a3728dc36786405a4d240e361ecacce566db9ab6a186d
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 10808 bytes
SHA-256: 1ad148812fe472da76a0cdf38817e553f867340dd4bfee97aa053757ff429e12

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