Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f1682bc4b992ac…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 14:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e7bd596aeae1a0128585d4f25015953 SHA-1: db358b37bcd48f8167b7ca1ec753448717b94bb1 SHA-256: 38f1682bc4b992ac7934e024bb009eb53b601cd771dd427b76ee8d59b995bc0a
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 URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as redirects for phishing attempts or to download further malicious payloads. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6232e8e0a9---jezadixapidavenewuve.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11de1f93bcbd6879b53d19a5dd5fa928/rotexuroborerofu.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/50107824085.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/tilomovunaguwatok.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/89044418818.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/ridoxulemizotaluwufabu.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/43695164183.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1897222712609f766704c11.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b3kclj6s5vet6q2ss2082tg8po/89695522022.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717b0d3e689---fitufukugo.pdfIn PDF document text
    • https://sealskinz.ru/files/file/4358535499.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zanepuja.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/91239899426.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ivho7a4vpih4mi4ll2be9ela3o/gisufefubisopalepomu.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/palogosigom.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/fenawaxapogipor.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be0de6303---nefovenoxeragomakisudox.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pesover.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161358cf91d55f---89104667676.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/39471954581.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/152bf1c89e04c72af054e13f60643934/jakiwakazirogezufizisarix.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/lipiditifunurim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hanuman+chalisa+lyrics+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d6def1a5---48197867796.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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 20708 bytes
SHA-256: 5ae6a0bec91892f364ecdc0ce4ffdd04ab1b2de4c988aa19a8cb263f60fbf776
font_02_sfnt_off000131d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 10740 bytes
SHA-256: 167e25017daa6e1325258ec486a13326bad4c6b59f4e30f8192b600ff9fdb986

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