Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9380ee3fb7efb9d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 22:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86e2e435386d108946ab4724c1a8d57f SHA-1: e6e6a2fef3a929b2132ea728c835f662044b777a SHA-256: c9380ee3fb7efb9d661cb8adcc82ad6a4c8131b9f9c485fdb81946afcb2eedb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=mod+money+dragon+city PDF link annotation
    • http://jgbt.us/pds/userfiles/files/83404663298.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/98007760301.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/fezukupotitemez.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/noxazazexirurapim.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/tiloxaromexaxesadiwo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138411c614b6---mewiviwijetukoku.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/lefapafapanizogono.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/34368969670.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/44c5d00906caacfcf0c93ee7a40cedf6/ribof.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613564c52fd7b---63367928123.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/44b89d1e7196b74bab9b3cbef05528c4/ridejabaditoxuvozurugexot.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/ludepevogasoluzutalar.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/6405156973.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/nanifexobemowupu.pdfIn PDF document text
    • http://zenkatsu.dk/files/tefixapasagunolex.pdfIn PDF document text
    • https://digireg.ru/upload/kixezoxubagudawim.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/wibeg.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70baaf13---baxibiva.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/digatuvuka.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/48480153193.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9d6caaf7---wuzuwewit.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/xubap.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/wavojotagonexiveke.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10604 bytes
SHA-256: e7abceb571ac9407dd35a09223167982ed9e719a9c86dfd7bd17966ed35c0d97
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 17220 bytes
SHA-256: aa3572d2b96329ae3eb3fe9a00cd1361387e2f00321d44754672263793070b79
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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