Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c374ad8d4ed29b8…

MALICIOUS

PDF

76.1 KB Created: 2021-08-14 06:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f8daf7c5935fca4bf731715c9356c8e SHA-1: c16db11ebe83cddd4d3ae3d65c5a4f5555795614 SHA-256: 8c374ad8d4ed29b8ba276e003769567018620d01979a8256f969b2b1aae7adf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's part of a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3f93524a---gadizibinux.pdf In PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/32709828517.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210707_3A1BF71CFB399411.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/warutekita.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/99e28f9cb29eeb70e1fa2e2e412a5b76/bevilolozawobupawig.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d42f7099e71d0bd42b23b5b3788c2b41/pakifadirofu.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/boxefitununepirafipulida.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/53148919590.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/84848449466.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/posajopijijipa.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7e47c41ba04f712a82b03447f409c2c/rolobisuwep.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/95799600440.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/45579672991.pdfIn PDF document text
    • https://italvaping.com/file/25963911166.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65160be2d7---85236542408.pdfIn PDF document text
    • http://lblussana.it/images/file/vabopamelisuv.pdfIn PDF document text
    • http://congtyvima.com/images/Download/38390392790.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c9d56b318---50434322423.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/wewaralolederama.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/tupulababodinifaleroburi.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/galasusipusunutalaka.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/047d26a9ffac9dcdab7db18a664b3555/3717808680.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ebcbcb7bc---50813521679.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d566ecdf4b3---5115420082.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9adec6588ba1f05dafa38981fe0e1185/97324185160.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/wajojemufufomodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=que+es+un+cuadro+resumen+con+ilustracionesPDF 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_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 10692 bytes
SHA-256: 911ca9203a40d057e20e776ea76dddd0b04bab5eea2a9cdc7873f6f00dd53810
font_01_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 16604 bytes
SHA-256: 0fe1a25be2fd33e31bf3db65ba4f6ef3470ab62307c65f7ab27334cc5e62ac2d

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