Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae4e794e21ff5af…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 16:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6e75e0df96159d6a5a2973b56b76981 SHA-1: f1b18dab1c1587405cd7dedc686f5e7f3169193b SHA-256: 7ae4e794e21ff5af8769ba3a33af979ed314b2707897c9f0ce8a5cc11aa65c57
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clubberia.com/js/ckfinder/userfiles/files/vezedajawejoxufudibazokow.pdf In PDF document text
    • http://reklamaopole.pl/userfiles/file/308675464.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/6051136270.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/dadujug.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/wagumosutawal.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/41662804863.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/l40s6b9s17e00nftkjs1sbd0pi33gdgf/xovilorujefilelemobidilo.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/10812556233.pdfIn PDF document text
    • https://wsbtitan.com/images/file/julugotilifuwosujojokab.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/sajadapigerax.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/9424594673.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/panivubupelixafemiwar.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/20641264252.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/tijavujemuxiked.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/46549677384.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/jasexovawixosidegudi.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/wopede.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133a60075db5---jiludetamapabokiri.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/5390374214.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a021782787---98128799530.pdfIn PDF document text
    • http://checopharma.com/upload/files/21592587080.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/faxopejejudof.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/gifonerulazisujep.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/718599c5ef0c273dd95e9058f2f39153/nijidosajodik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cheat+mobile+legends+unlimited+moneyPDF 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 10980 bytes
SHA-256: ed1e55ed35129a40a4ae2d663fc0b5d1dee3f9f2072f0d2359df3eb76358a6d6
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 18924 bytes
SHA-256: c4bc96e35e59fb576eb51be6b79c0bcd6aa4b56c170f265a0bc7063a02a2ccf1

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