Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3866c1ce847ccc4…

MALICIOUS

PDF

80.7 KB Created: 2021-10-06 11:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1b640bde29072c3cd68a45b17a1185f SHA-1: b239da0c0cbb9847145baac53a66b39f00830181 SHA-256: a3866c1ce847ccc461dc3865adc2d78e81f1e82b933e4ede4cca20db456c95fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abnicum.com/files/file/56615535567.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613db59a97960---50751041318.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/21045109586149a5023ac32.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/89c22a440e0f90ac33909e5cd876ca3c/75501709265.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/nuvan.pdfIn PDF document text
    • https://apra.pl/files/file/57761095383.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/63553371281.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/88558534537.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebfca01004---14818802868.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/nifobejunilelivomi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/pulubefakazubijojilolof.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/91557579478.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/jibedabesewapaxorinid.pdfIn PDF document text
    • https://sanidom.pl/img/file/88636471328.pdfIn PDF document text
    • https://raghuvirtrading.com/userfiles/file/wovigoj.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/48769630592.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/jepepenanonazino.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/judokijubepewomaze.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161543922ccaaa---88087667598.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/55936427832.pdfIn PDF document text
    • https://basisangka.com/contents/files/75453961610.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/68198898655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=throat+chakra+meaningPDF 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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 18516 bytes
SHA-256: 82a437ffd3a6987b833e5c40b0b3ef9e76e8da32855b154bc0ce15ff82f47d65
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 10516 bytes
SHA-256: 84b23e75beeaffb9c336bf91421868a6820ffefd349f43ba6466426805ce7ead