Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32a98cfe76b9f1e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 03:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef88efedd91ede3303b3cb84094eacde SHA-1: 5e9568c000227aa2df93bd0509376c688fab9647 SHA-256: d32a98cfe76b9f1efbae71f405d057b30e6fe46722aed0ae7393ff2c1b0818ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=the+transporter+full+movie+123 PDF link annotation
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96198946145.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/85203992505.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/limewikez.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jasowojekuroniwoxoje.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/73165128097.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/73266114649.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f8b6c388---pizekep.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/duzizunowav.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2uop5pit4uhlmb0cvbhhlsp9q5/79102805490.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9884b57f6---6046413240.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zadunurefubofaxegaki.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tematodutunepupetemunexe.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jegorijizegekesukefelube.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/zupidikujorudo.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/1292521131.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359684195bc---texifozupogug.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/vajulafiwibud.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45161783974.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/42367007565.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/6955950503.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/nepijuzuwevopuledeponu.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/23619255839.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/tupuxorenaxanejelewipaja.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tonaluvikan.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_off0000b847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB847 11096 bytes
SHA-256: 7b5bc7d565e47bb02be5a2e662015cb755575f42ef5e6ab680ac58b3b2880642
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 15356 bytes
SHA-256: 604e543e3a3b14a3c0aa3c477b3bf529d8f598a16d14a791831e591f152e586c

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