Malicious PDF — malware analysis report

Static analysis result for SHA-256 273ebe6d89bc8442…

MALICIOUS

PDF

93.9 KB Created: 2021-09-17 11:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c1573baa8d27246acd439ece5778665 SHA-1: e9755ea341530eee5acc2d83bba1382b6cae8b13 SHA-256: 273ebe6d89bc84425a7aa127da46e8e1a77f0dd5bdd53e7543b4f41b48f54553
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs that form a link farm, likely intended to redirect users to malicious or phishing sites. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=organic+chemistry+janice+smith+5th+edition+pdf+free PDF link annotation
    • http://alnoorcity.com/userfiles/file/naviza.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/waderezobiwutelenopa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sfucn2iv3oe0h9itvgr07ei3vq/bewebazifegi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613538229205f---jusizufasixoruwazuw.pdfIn PDF document text
    • http://saaretravel.ee/images/file/65509736126.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/pojumemejokezusugakoxenos.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/84021450840.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/vebifesobetuvagajowi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rejuraxosekepilufujureji.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7997bdd914c550843f9f93cd3dd5dd9a/sonodolediveropor.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/gagevimunozobat.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/nijutanedusejivimuni.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/xodolemukasik.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/korilazuzuxij.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/70116374191.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/mijiwuzizujifolabotoge.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qf5617n5vehoijk3pj63h3hoot/gomelivivitizomu.pdfIn PDF document text
    • http://sbairs.com/datas/files/zijokotivixamij.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wisijeruwokavopug.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/054762d572ba387eebb50957d647a710/vedenavojobota.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/ridogefisosirifalasuwuwi.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/99395990082.pdfIn PDF document text
    • https://novitas.ro/files/jogepenekez.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/gubuxi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/68025605122.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/fokog.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_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 19060 bytes
SHA-256: b2eeb2f260de48dd4e178001d3b232deb416f30951c6025b5a1d8f54d7d6bd48
font_01_sfnt_off0001369a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB1 11424 bytes
SHA-256: 1605a72b4021b721d4625f5e521b3ad00cab48f78ec9dc6d5fb08d2355b12e21