Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8da9efbd8b01f7c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 22:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f142e2eff0b0f8a6b54f9b1b59c5356 SHA-1: 93830317e0fb881d76195042d3dc075298571394 SHA-256: d8da9efbd8b01f7c7308807e79acd85371bbc7f4504c2109764f83529dc90475
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mwcapital.net//ckfinder/userfiles/files/20376898264.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/figoxozijafeveworuli.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609075544ea8c---xunojaxiwulozonenufudina.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b078f263027fa9c9196f63de1db1a49c/6142170589.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6d64be60---36156358550.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/clvp5dtgka03tu2kpm7eum6t51/98688094431.pdfIn PDF document text
    • http://rafaelokazakov.com/file/joraponize.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/getofigukosenotilijaxok.pdfIn PDF document text
    • https://777mto.com/contents//files/vopivexitiluwabixiso.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85aa95435b---31964805922.pdfIn PDF document text
    • http://fitviewer.de/files/file/lonosupomaxotamun.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45729539742.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/4505128688.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/mosezeva.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/61015003107.pdfIn PDF document text
    • https://educhina.mn/editor/files/roxudebivororadoxumuvoto.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/sokarofovawipomanem.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/78dcd45e94fef2c3a3a4fdb1fc170439/xesube.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/43457851758.pdfIn PDF document text
    • http://erictex.com/ufiles/files/segijusobafizogasi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/q5kaip29f1gqft9qbshloh7ggo/wutusugapav.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0eb0d4439---57724761532.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/jc03j7jua6thgvjt7s5jhtogjf/peden.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72772becd2---fexisenuvikutiji.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/86522766060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=add+image+to+pdf+jspdfPDF 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 10700 bytes
SHA-256: 0a9f4ed51ffe042c6671cb99f779b71bfd60bb980f300a2777be249904081b26
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 18164 bytes
SHA-256: b46dec01a9ad34fb3395e8ed805fa12d7bc4c068deb4bfb0b71ff38d33a5228e

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