Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c175a43877dcd4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 15:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17488bf37daf11ea13e72e14c49a9448 SHA-1: 5d01e180035c475e3a51760ef2d6d557eea40d4b SHA-256: 42c175a43877dcd46841884008b62c59a20a0158763b2979ef13e27ccdb78298
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised WordPress sites. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=family+and+friends+special+edition+grade+4+pdf PDF link annotation
    • http://schokozentrale.de/idata/33580458610.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sedirosokubewesin.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/risukawe.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078193112c71---tevadatewejefifizixabuba.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/25548782581.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/75926540104.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wevemuvazimuwu.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/bomiguduvuzepo.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/jenixelaga.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a53c2f065---kitifikarikowaf.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d330236aa89---91934296407.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092370b01163---33088172640.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c81a79f05e07c7c612ffcddde0cbdbdd/togafuravov.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/wenetivulolurake.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p13i3sn7vudbn5n3vrri0i1qg4/6555210316.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/novevurexunilififosi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e499676f31155b7b900d976785f7cd75/9463469905.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qnbkm801a7o138g605lvm5ng00/fotujakarozaxuvakipavi.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/winovebovafiwiropazulele.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/fubidalavaxuzom.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070d65ad1018---jizenataporef.pdfIn PDF document text
    • https://digireg.nz/upload/vilus.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/tixifixulidenisunapuvise.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/wedenajubupupu.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_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 11132 bytes
SHA-256: 06dde458e7dc35348d3e503464ae8c97f491501fd08de76b2ec24ad4989295b3
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 16960 bytes
SHA-256: 7261bee9e394dbc2039af625f91da8e31e9b37e2daa662362bdd8720922b13e8
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1