Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bf2ab3f40a9918…

MALICIOUS

PDF

74.7 KB Created: 2021-06-24 03:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7e466559ecfecc75759a333ecd5195d6 SHA-1: aa2afa62fe35ba57d8dbc2936dfb96176a726a13 SHA-256: 03bf2ab3f40a9918af28b5c8463a5ab7bc5c32c216c0781a17bead14497c6a1f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible from the readable text. The presence of embedded URLs and the heuristic findings strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=discipline+in+schools+pdf PDF link annotation
    • http://rgn2u.com/userfiles/files/dolosewofevexusan.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f68c4b74---9129981972.pdfIn PDF document text
    • https://soechi.net/userfiles/file/47960015815.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rtc05l841nqblofcp200gce0i2/32705687601.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/84509896668.pdfIn PDF document text
    • https://advik.net/userfiles/file/27733202166.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qfrm7t3mkg0jg5h4o23m01km1g/84182661857.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d390dee25ec18336c225fa8cc3f18ab8/44320542681.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/251821377218.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/78427034116.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/5eeb7c73c45f59453cf2303ea8992eeb/4414682451.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2b9c31f7022d0a730fc320ebc07b3a1/xevetos.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ad7e4d47544453451a8aa4ff849bed16/83089077497.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/petin.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de43b26da---vegufuju.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/36228278196.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/50309691231.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/41539192004.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v02sh3p0a4fp6v7o3d3giudbak/58945185212.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ecfc577e---65275904388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 4936 bytes
SHA-256: f2460abf7389b394287f5d9323e0ca30581a71a69df5ed58868992d253ebcb5d
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10668 bytes
SHA-256: 5c493f3c87117a45703225b88103e3041fd063f4fb83a01832bde695aee82958

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