Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c244b0de492a08…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 08:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72798c2451e7e30c21a9bb51a37b9743 SHA-1: ef5a3af23753b46351a6151125852b884e25426f SHA-256: 93c244b0de492a08f8cb5eed59938e270a170985453ab3eeee98b647f8d8d2df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://stbenedikt.ch/userfiles/files/70124558802.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd1d8330bf---xolanuge.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/58015122035.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/81064b9a173453d27a2abf77e0cb591d/kirojirukeg.pdfIn PDF document text
    • https://go2germany.ru/files/file/xasujozalalode.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/durotegunodob.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/79cc3534b3886a13f7341677b956d7e2/mizuwubewajeved.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67efbf512---30304425034.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40f0da6544---40721818681.pdfIn PDF document text
    • https://argumentua.com/i/file/50910321773.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1d26b0c8---86589157631.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160755adc77bc1---70898334072.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c647e53b3---rigomezub.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vgjub60ic2dsjtbpsm0argb3i5/runasefotunojexir.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089840167e21---96727717995.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/6147489758.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1758c922---19194269817.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858b0b345b0---ragimavajer.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094570ae3599---49858006316.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/27b5cb61bc6ce714ebf84d6f7e76fe08/dozitixizesadape.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c932033d243---98271857205.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bd0cd4346f2f5f27ad57c10d0825d028/32287330518.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973ad1a9287---19718059701.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/66774841142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=squamous+cell+carcinoma+treatment+optionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16092 bytes
SHA-256: 98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 17236 bytes
SHA-256: 0cffa0ff0674b69f003c2cdf5eb90eca39cc0aaadb361f714c8ed8063bfb07de
font_03_sfnt_off000150f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F3 10856 bytes
SHA-256: 415e5d6e1c7254e8033b9cc208be88a1942c58f26225666389875b896f90c6e9

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