Malicious PDF — malware analysis report

Static analysis result for SHA-256 0831746807cf2408…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 01:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7acb0144df13edf8b4db65c182c842f SHA-1: 1c79a9954fa91e63a65b0a0d9d74299ad17727e2 SHA-256: 0831746807cf240833bcc8bfac2be644d516d62cccaa34e0f40aa8bc3f873bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's designed to exploit users via redirection, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c0d5694e---23522167721.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7si5a5sj2421t76bfk57ct9gu0/17117358281.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6f991519525a8cad30d25094c159dd88/45086913195.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/21793146081.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/matuzeja.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/kovinujagum.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/9287945562.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/sefireduvarijasazeli.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/91345959192.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/lukuwurakazosisad.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be62dc74b38---42397527446.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/25865893113.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/13027442082.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/tilaromaxakulofumon.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072102bc1f34---nimisudufu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac121faf901---65910717336.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ucmfpb973o3hsespl7epts6870/xinisegaxajobofuk.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/pidalolavexatedolugu.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/42869504009.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/mitawanimilarojokafewa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3bbvdaboj0n650lhu0p5oj1fni/89454842095.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zekirevidojoxujafajur.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4972754369.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9fa633cf7---12719426416.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/86536807190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=platon+biograf%C3%ADa+pdfPDF 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_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 17616 bytes
SHA-256: 614bb9f7d550d37d3a6c411abd7efe6a0bd1124436d09c0104b3123964174585
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 10576 bytes
SHA-256: d2a5867f733b6abdd9ac42764c14dfe4cc1e6c2212b16748679e47264173ceaa
font_02_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1