Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5f7f3af122b299…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 05:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02646a3739f5d5cbb55777413b3df314 SHA-1: 0a59d33d095d4f8745afd2e0c5eb81ee277e764d SHA-256: ea5f7f3af122b299c563c93fd91fe42c71cbc7ce4f65ce1214719f76893e8fc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that redirect to various external sites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=runescape+classic+android PDF link annotation
    • http://elitvorota.ru/f/file/96424982659.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8d399a33c2a8278ced2a4ca76cf76e41/96090626153.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/72192400036.pdfIn PDF document text
    • https://wmu24.ru/media/file/ketajonipo.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/jituzodanojakatenokatag.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109050534038947.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133441c4d880---47372899021.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/definirupawakil.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/53976334255.pdfIn PDF document text
    • http://whatdwellswithin.com/file/89330120040.pdfIn PDF document text
    • http://jaqalsports.com/files/file/godipofuvev.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/vavolojutesazuduje.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/86037140069.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/47991887795.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109062147529391.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1cc22b67---67222888720.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/govizajatutitanuma.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fozifojuduvogibuvimopot.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/vutabopogevitosikikojagar.pdfIn PDF document text
    • http://mobil-tech.com/files/61886115966.pdfIn PDF document text
    • http://scsytech.com/upload/files/lezim.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/kifutupeniwesigilapa.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/bukotogix.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/najaxofulenamurasawekaba.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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 10552 bytes
SHA-256: 971e0fb0eba5e12cb2766a91ea404cbe88d46a7eeeb810a6d60496f5be8b6a80
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 18872 bytes
SHA-256: fa94bc93e59a826d5e1dcb7c47fa5ccdcaa84e888e3c2e2969dc2efbf7159dc9
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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