Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a05d7a8f4dae33…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 23:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37b007f09bcba443d7582450bbfa3dc0 SHA-1: 9fcfab59265d782ed16a31c2549abd04aaa079b5 SHA-256: c0a05d7a8f4dae33603c013006e077430e56cc5437903c8b763f780b94a2fa0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, offering no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=how+to+do+stock+fundamental+analysis PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace8d0f347---sixugejamijaxivujeje.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/gifaponipuliruwexuf.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pe3otqr3dmsjcqo213bslekhud/jetizufixekukujafoneju.pdfIn PDF document text
    • http://babamoleskine.com/files/file/vusikigepilomofam.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/78515462661.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fotamuziwarifelifu.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xetan.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/kozesinizivar.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/85970176033.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d08eff33f87488d9e96943b24a28c0f6/56019826325.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a2c79e29---30591588712.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/61127752359.pdfIn PDF document text
    • http://geasit.it/userfiles/files/vakaj.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/bevemep.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/darasitekug.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/25663880341.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/h3qvt418rjpago5f8beagfsb86/33082023986.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/33975616390.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d99dc1a---82349155095.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d29c435021b5666bc58dc8c987f07a83/58572049924.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/febifenaduwikewax.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/77718998829.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_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 16708 bytes
SHA-256: 1b558ea1c8ae8657764c36205de6b875600a7012a0aa092f6bd18b7e48e62ecf
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 10920 bytes
SHA-256: 221da754367d977e8f6ffcb93084f53e711c2b55b1921ea037a2e9650dad8324
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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