Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f31d8a38c5dbf4…

MALICIOUS

PDF

276.8 KB Created: 2021-07-06 00:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4a54ec80c50f8c8d1cb14789eb6265e4 SHA-1: 130f1db78b7eb8322170df37ca702d1317be10cf SHA-256: f8f31d8a38c5dbf4a82f9e3e991160c034dafe6df55c0ca91881f27330999866
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, some pointing to compromised WordPress upload storage, suggesting it is part of a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://kolaykanal.com/userfiles/files/67088689033.pdf In PDF document text
    • http://auxerretv.com/content/public/file/76213009371.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb60968c46---sonifuvusurepit.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27f647754---netinulu.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/lajozusikisuwu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/22588842962.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/96409195643.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/vifesuxinejirixofuwab.pdfIn PDF document text
    • http://sam-global.ch/files/file/18633023449.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896c04696ff---84885373926.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f3686319---pijemomisekubefojo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ae48d50950t6bu5cqoi6fomt6v/bamidaxozal.pdfIn PDF document text
    • http://poiskvod.ru/images/file/11220316895.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a12cae18c41---66294174739.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/runigevi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fd9af4723e2b6117bef4741879411b18/32673574568.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849b8b43ed4---mekagodas.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/206it3f2v1qr73opok57cc7116/vakadota.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fa1c21fb---46738436961.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pujedufufitubeboviloxaxi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608820e2944b2---31229320388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chapter+5+maintaining+mathematical+proficiency+answers+geometryPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003ba7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA7D 20228 bytes
SHA-256: 127c78729099d834eeebfff61995c896640f640ae3be5db725582a3600f284f4
font_01_sfnt_off0003f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F0DA 16396 bytes
SHA-256: 550edf41366bc721f0ec02a56188964ba3de2c98a02197f4e170251b039a2f60
font_02_sfnt_off00040743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40743 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_03_sfnt_off00040ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40EA4 11292 bytes
SHA-256: 6ca48c106235a07e57a7e98b662ebe1fce2a19dcc4981cd0db5128b45687ddcf
font_04_sfnt_off00042928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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