Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ca41c800d05292…

MALICIOUS

PDF

76.5 KB Created: 2021-07-19 12:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad9847bdcef5376e52d9196b79c09b7e SHA-1: 0658191ceb8664e4f97dd965dd1676dc34ed268e SHA-256: 10ca41c800d0529293e0d0cba7e0f14c8515918a93475bea75ed2b0e014ee8b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating a phishing or malicious redirection attempt. Heuristics identify it as a link farm on disposable hosting and a potential phishing trojan. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or compromise their credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/27ac6abacf2e810c6a970bc70833ef7a/pivetegudubotama.pdf In PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088acbd2f91c---78424192781.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/45687767869.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33934945527.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/17494772130.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/8629638496.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/94410386018.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/76554157889.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/linibomenagedefovenozogix.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbaee88fa7---kimubijepovo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/nuen5qriklp1niblm9benn1161/77112294731.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/zubika.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77929664567.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fpea4r6ah90qg57ukqvbt7o4vh/88933178038.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/bukogaritazemulen.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4elk5gmpdp3m8s1p70nqe38ceb/97446972526.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/5880455424.pdfIn PDF document text
    • http://fitviewer.de/files/file/wokadagijisatevomo.pdfIn PDF document text
    • http://iphysiology.ru/upload/kivakizorodetarumi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66caaf042e---xoxuwusodokijumopubejo.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/4774410949.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/36776209285.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/93464911560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+insert+object+in+pdf+documentPDF 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_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 16980 bytes
SHA-256: adf6c02c8a4886f6de7bd5abe8e1fd8ea18ffbf7e2850401bebea02b29fbf0da
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 11020 bytes
SHA-256: a4110f0517cdaa28125bc4e5a1be459e193265c436202cca7ce8981603bb88cc
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1