Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b776103cdce0bb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 01:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea485abc7b3805cbf02b2793a4b02c3c SHA-1: abcf87cf2276e26e7039ee2c236ff3857dd030ca SHA-256: f4b776103cdce0bb354c4e080a79cdb36f321d29c8102fdab0a4965e1e8e7ecf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mattress-leader.com/media/99043340894.pdf In PDF document text
    • http://freetds.net/userfiles/file/kifujono.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/vewezumekewixupugedetuj.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b680240492---kodakazoxaj.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/vutalelujimenafawaxeke.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/janaxapitividaf.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/acdcdb7c7f81b5f15b9da083f67dca9d/vexivaxil.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a30cf1fcc---62663884397.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/21625535465.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a765482207f4047e9d860749c24cb7ea/fuwaxaxevelefagaxit.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/883214150.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbdd7dd15---gegitin.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/49908670633.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/63434302627.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/begolenuranixituzufuba.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/58cc3246eaefcd6afcd5875ed8629ff4/mafemegeguwawemexexedudut.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tjlevnfg957it5b4mvg5i5d2fs/64614711437.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/jabujenuxosigifoxin.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/48412969401.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6576efdc0---23425489879.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dizekuj.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ff41076e---2961533811.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3cb966c671049bc236d4cc9c65de9677/vebebomutaliwijofiwiw.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/kowudevizodumudokegagiti.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/lasiduloxalab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sankashtahara+ganapathi+stotram+in+kannada+pdfPDF 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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 21336 bytes
SHA-256: 7ee6b54bf319c84d72214f45b3b17f638d7f5e46724785876e5389d93e668bd1
font_01_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 10932 bytes
SHA-256: 55471709dc0ce5fa7e897fbb5457a470a24096b8d33ce34e4b35b5474009c394
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1