Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d6fdbafd1babb6…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 02:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fb8e5756e8c06755f59cbeec699026f8 SHA-1: 5f3e7ecc172d4c90af23240bbcc61aa012ac88d4 SHA-256: 86d6fdbafd1babb68f05f675cea3048cc413970bb94ee0ba67b6764dd2c23585
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggests the document functions as a link farm. These links likely lead to phishing pages or further malware downloads, attempting to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=watch+demon+slayer+movie+mugen+train+online+free PDF link annotation
    • http://pacemakerpressintl.com/uploads/assets/file/kuxobufofemisezodupefema.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcd6b6462---ledunufif.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/10784284054.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/kejefota.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/10191254917.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150df739ba19---xifajudasilonok.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/abb725266b1bed9d3f99ebd6c0318434/17392630265.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/32560519432.pdfIn PDF document text
    • https://citronel.com/userfiles/files/65168264883.pdfIn PDF document text
    • https://dacola.com/upload/files/45395851010.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nanivomibokapipiwuwefasos.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/87039053184.pdfIn PDF document text
    • http://teplospectr.ru/images/files/59735632154.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/36804052997.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/gofugexirokeverafimiv.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/16254319164.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/23128435479.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/69362328248.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/41955526151.pdfIn PDF document text
    • http://napiarsaigh.com/images/guwapodagamaweluxu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/kevitukuwojupozofonozej.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/giwanusewixova.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/ratakajasatufusurakedaz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nerekubeno.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/tafixamenikebewida.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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 11196 bytes
SHA-256: 070069793cf3ab0c1442df2a937292eaa87775a7f9c487b3da99184d9eaa2138
font_01_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 17896 bytes
SHA-256: ce7de591f58219c957a8e788bbbf050c055c21317faaf58d8fa637a88cba25cc
font_02_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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