Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3019d31a743fd5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 08:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f019df911063710b6d9b1961167a997 SHA-1: cff48a006f815ce34ce673f0cbc3eaba5b19be92 SHA-256: 9b3019d31a743fd50b0b9f3fb07364dc82f2e9e564d6d04be32d236b31920343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on compromised CMS uploads and disposable domains, aiming to redirect users to malicious content. Although no executable scripts were extracted, the structure and URL patterns suggest an intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://avstralianature.ru/ckfinder/userfiles/files/92382676341.pdf In PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/lopedesip.pdfIn PDF document text
    • http://bamor.org/userfiles/file/mowutixuganu.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/surazad.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/29714248122.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161513a9a762a6---xalarerebigenu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebbc5af7c---15655205726.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/pobamofiwexebem.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/83749644681.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4351476ff2aba9ea22b56952695594fc/80789698893.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/xobube.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3fe9b13a23886731d8fa40ac76b45310/jokasavegeliroz.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/menafazekizulen.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/rabitegad.pdfIn PDF document text
    • http://z500.si/files/2574288112.pdfIn PDF document text
    • http://jn-zhsc.com/upload/tupiresugemimati.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/89126239807.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6809753158.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/71556213801.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/65103468688.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/rumajabivoba.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/59740316269.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/80349134632.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xafukulumoruruzexifaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hypixel+premium+accountPDF 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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 18336 bytes
SHA-256: 83e97238b2a62b8fd2f0246b3aeaee38ec791f129458bf79b000ac4e1a0ff11d
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 10672 bytes
SHA-256: 419a6c968848349c1723b37dc1d74b6b5490aca97313c8200b3637e8f47a0b8d
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1