Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7c86c6205356c4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 06:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e71644b99bcae36527251c1f52745524 SHA-1: 46d90ff18154a948b2e57dc0f029d8bdbe8f98b0 SHA-256: aa7c86c6205356c403ebac0989dc9a2ef4437f3cc140b9fa6580ac852b51562a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm heuristics, suggesting it's designed to redirect users to compromised websites or phishing pages. The embedded JavaScript stream further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=metal+unicorn+attack PDF link annotation
    • http://chinhsuasolieu.com/media/files/80475309118.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/jikeworedurapugisona.pdfIn PDF document text
    • http://balone.net/_upload/file///71594021369.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613554427e247---zalogutoxuduvomikuleren.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/66481770706.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/fulelazugawujamok.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613936bb4db37---23863191583.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sepanomo.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/vaxerumeg.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cde2a380---67016682180.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/71838580619.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/jevoneka.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca87d48f0b---pomageju.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/gedalutefosovologul.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/bevutawolemojone.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-01/2334d6754b23862f24ba508cd0482442.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/81855812004.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/51803644657.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/fidifogejon.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/141b39cb337f29e4162b94ab73dab1f9/61010040364.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/betatotatet.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/somenejipadifaxujuxiliz.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_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 19176 bytes
SHA-256: c17863ca9a2ac8fb6484cd86ac527395ba6c81c2a10686494f9d27d7426add3b
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 10240 bytes
SHA-256: b2a8952168e2f45a088317bb581365f83360f55d4f907a0ad6a862c5d85df0f0
font_02_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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