Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a36690f88c4d35…

MALICIOUS

PDF

92.5 KB Created: 2021-08-14 18:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f275868390738d7e40c8e41d90b5213 SHA-1: aa274164d2983a5159b358e536063c47391ca43f SHA-256: c8a36690f88c4d3533a0e91c8153f1b75da92e7743f74ca24d0ab53790dc09d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, directing users to potentially malicious content. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware download sites, aligning with the T1566.001 (Spearphishing Attachment) technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://coretry.ru/uplcv?utm_term=lectura+eficaz+de+la+biblia+resumen PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/uac9a64jr5bqt983v857ls0ci6/1622403373.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/29843036232.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/17823937799.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d069aaa1cef---34149795942.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd56bb0de2---vuwijoz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38160cec6c5fe9c144981e719d36c830/risox.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089066236454---15970397003.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89b4704f6ac4a21111e7dc3e1f65b31d/57444813118.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/liranipidevixawaxaf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af1a20cd9---1119435383.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/6050262567.pdfIn PDF document text
    • https://belloverde.net/emailer/file/duxogumud.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf6253f89---nobixobesilawara.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/pifipusebawajinidakur.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/lowusubukubolovubu.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/ritiwedababaxon.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/34411138270.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/digijilabifejimitu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9f1f54c26378a03bc9af80d2ac5be960/natejovofe.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5ecaf684---masiborunigipevowabimaz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13521774ca---57846818436.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907593dae03---fufugurimatisuparag.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/60887108158.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_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10776 bytes
SHA-256: 95d8454ea14e24f1e46fc7acf8129ca36fe78db4dfe625fe84b3470120cba0cd
font_01_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 18532 bytes
SHA-256: 9e271ceb96d7c37c153db2da9a84bc116ad0f16c6757d11b4139aa6b9dc847ed
font_02_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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