Malicious PDF — malware analysis report

Static analysis result for SHA-256 269e429165e6b6a1…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 06:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3acb61cfc3ad76511568aeb3027ffaed SHA-1: 897e4a2726ffe2b26185849fcf073fbae46de49f SHA-256: 269e429165e6b6a1657c76e3bdb64c771c45f23e20dfec5bd2b18fae069f1a5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nnkcreations.com/userfiles/file/95671733576.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad17e3065c---sebagereritibivibumilipe.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadff170707---tiwekusakajunibevopi.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/98773305872.pdfIn PDF document text
    • https://dacola.com/upload/files/mimojigefukuzejepet.pdfIn PDF document text
    • http://garderoba.sk/images/_file/91320815556.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fad4dcd3---tovewejiradifujupinub.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98932f033---molowoxija.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/91224860623.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff403f29f---lagafivifolujawa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98ea53e9c---82905145688.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/40235527771.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d9dc31599650eec19c7a4fb7e2042b1/ronizuwanimakuxajosafip.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/10376132536.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/rivuke.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jevajikomorujaboxani.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160766dd997367---634569299.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/02d90121ccae10efa17014c9e1cf09aa/82802959662.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b76548ba5---2076525991.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zapamowilozatapugobim.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wuwugadonewosi.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/bepegomebojorutekol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=primeros+10+presidentes+de+colombiaPDF 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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 17264 bytes
SHA-256: cd65a90b8ce0104b2d889f9b70430fd67ee70f80474e4e837ea45f1c8c55616e
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10988 bytes
SHA-256: efa94bd5e05ec5dd90cef6fa89dc3c4f7d1485e3e0d1f3e8c5e18a5d123f6a10
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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