Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a9f95d43981258…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 17:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4e4a04f945e4c1e273adae57388c587c SHA-1: cd0d23045dd5cd6accf01a8d20f621aef747e831 SHA-256: b8a9f95d43981258eb8ecf849c8c81908cdf5fc23b394011b88b20e06dc02e62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, suggesting it is designed to redirect users to malicious or phishing content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://novosib-sport.ru/ckfinder/userfiles/files/97996355856.pdf In PDF document text
    • http://soon-xin.com/fckupload/file/dewinuferoj.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/zatam.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tasajubunirufusefivumol.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe29b81731---vazabafuzuri.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef2551b31---wuloginawisuwasuri.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/mefifofedonet.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/vusasazipexuxo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a171464c3---44804050802.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ef00be8571bbf8eb73dc655e39f70c4/zevijatex.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1dvoooibc38ofnqo545epg0he0/bavawadexujadidesirube.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b630541546---39781193075.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ee41f59bd138f38e201863d34f795949/pajelejerokudijoz.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/20613179267.pdfIn PDF document text
    • http://masonhn.com/d/files/rogamopibunaw.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/53000190489.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/46dfb6d675aaf9f03c8b33f75c235c14/19249482094.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2d85224e---95571323768.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/96gdas7cb2t1qkcgtnrnenllmi/balawokanu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jilutoximid.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/7223912465.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/gakok.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2cb80aca---sigejuletonawuwivedu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d099071c99---99158205139.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b10e6d815768d8d7bed1e33ebe92ed83/potikofabobijuwi.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/sasuwidokafaxelowizosazob.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fe1ebe6897e2c957fd74afdfb625d8fe/vonugutexulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=translate+pdf+document+from+russian+to+englishPDF 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_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 18252 bytes
SHA-256: bc33e75792042e6a528692908676c3cba5bc75ed9ce9e52d8a0751d574acf72d
font_01_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 11132 bytes
SHA-256: 7a8cd3a9aed5808fb7438677405d8e308e309fe8307facdd5d634eba449bea15
font_02_sfnt_off00014261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.