Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7fcfb394614395…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 08:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e62e175ec4a8cbd99f5433f90ec29b3c SHA-1: de6463eeac63013a058111d2f58f1a63ac002e73 SHA-256: da7fcfb39461439556f1f261c869b3edec1c7a5bd5b4aa04c3ae5dd75dce52ba
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to domains identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://rialta.ie/userfiles/files/kudekukuzoligina.pdf In PDF document text
    • http://fitviewer.de/files/file/dogulawuvuwi.pdfIn PDF document text
    • http://bienbao.org/uploads/files/71466978073.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/80900491657.pdfIn PDF document text
    • https://zzwgjx.com/d/files/mevitifivi.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/lavasixizumojalija.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gadusekupilepoxijim.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/sositikikojebamitipux.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o7i6b2piicov6td1gffa00ael7/6153265671.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613942ded1715---49254687438.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/fozijobeguduwadipezufi.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/sasubajajefel.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090521145980554.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/14085884335.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136676aee20d---vibotefalevegujut.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305de995291---gexugelex.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/3099846528.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/pumowow.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/kulodefasoxezezegimuravot.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/fiwuxevazuw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9d6fd06ab119dc459f2aa25fcc153fb/40513309893.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/73531636839.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jererinopamiwiselepa.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/70978949669.pdfIn PDF document text
    • http://hkalc.com/userfiles/80503489548.pdfIn PDF document text
    • https://zzwgjx.com/d/files/newidawezoledazajogutaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=times+now+app+for+android+tvPDF 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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 16456 bytes
SHA-256: 2fa3816e6f03d0cc3c695fef29ead098c55198b8a7c0fcd7be75bae4475b073d
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10728 bytes
SHA-256: 0c24a03e6147b9c25dd69d931bcb60188261e540e2afe7c68f2f2a8d360aa3d2
font_02_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1