Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1966756ec70df9…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 02:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b26e8d62a37930b4d80b9434c8cb9817 SHA-1: 3ad0eb2200142480cf401defb3d1f6c4fe863b7f SHA-256: 0f1966756ec70df9c40d16e394d75abe1d285acadd0d9a9337a9ec1b5bf4e8bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://patriciobanados.cl/upload/file/
    • https://cvsc.co/userfiles/file/varagipewa.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/rofisovoz.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6c9effdf---45964497763.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8e031902---xolokepekuzopabakopaju.pdf
    • https://chezgregoire.fr/userfiles/xolalofefudijufapurof.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091146078581---gobovunu.pdf
    • http://alhouti.com/userfiles/file/76526792619.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/u5bjnvsfksqb7pt6d039dbeneq/legukonosogo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa4459749---91398664739.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c12c94f4af9dd743a1bccd00d4b51a50/walaxomanikowitumevisanef.pdf
    • https://faprosid.com/file/30587735990.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/bcc47e1081226a72eb40ac22bf895b3f/95412045510.pdf
    • http://parvazyab.net/basefile/api203/files/90647441553.pdf
    • http://pileshoppen.dk/userfiles/file/23603889856.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1430897f0---65168793044.pdf
    • http://to-kajihan.net/js/upload/files/41665184017.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b873ea943---86527200212.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3a7b46e5---7184740857.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946cbc38ccb---pivar.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf1bf2571f---26541965693.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/polamanudepimonoguloj.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/sogeroxip.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/67406981738.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+do+the+doctor+career+on+sims+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
font_01_sfnt_off0000f590.bin
4fbd451b23d83b02d51d7289341a6efc40a0f27cd886c457581e711430fa5254
pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16568 bytes
font_02_sfnt_off00012043.bin
4ae45616da6b067a9261a8587992016d906196cfafecb96005b65ca825544c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10744 bytes