Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bcaf3373fc8472…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 12:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c264d2deaa64507f32f668d67c4f330b SHA-1: b9ff89cd807eb3fdabf82f304ba484f325dcca7e SHA-256: 25bcaf3373fc84724073f02cae1bd906bd5139494d6862e0a3a9a1b6fb4a820b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. The document contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tasleemdubai.com/userfiles/files/bolokunopavozawuraxuvodi.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/viluxutufor.pdfIn PDF document text
    • http://lobi.md/userfiles/file/lufobaf.pdfIn PDF document text
    • http://katachizu.com/img/news/files/32765944503.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/varuzizasuwutavozi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405032b50c5---bulebexosapemuw.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/71174861100.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/31634794914.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/79071625237.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/kujarufajumimiwav.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35434753159.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357fa76a16---jatudowevolepijobulot.pdfIn PDF document text
    • http://abnicum.ru/files/file/venafasapakiliwiwipot.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/vexivipobarapopaj.pdfIn PDF document text
    • http://stroi-sistema.ru/img/23803208412.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10750127885.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161346a1ca9574---46070952402.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/60561421677.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/ganifibuvuwaw.pdfIn PDF document text
    • http://electric-kernbichler.at/wuletuvodolodaz.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210909062017_c774j1.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/96449310049.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/muzofirezikuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=justice+league+dual+audio+full+movie+downloadPDF 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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10960 bytes
SHA-256: d2fba0b576f6daad68f5d2a7682255bff6a76c303ef80781100eada680449a2b
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 18260 bytes
SHA-256: 598908a47580969bdd680da902f99669bf2996860d70a43bd48ea4311998382c
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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