Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d24890022e57a4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-30 23:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f91ad276d54961b93020a3f060cd70b SHA-1: 6acb385a1a92ab740feccdde386b856a9dab61b0 SHA-256: f5d24890022e57a4a77bd5b1f540e51660af937286c168c8f8e1ab455990f761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary goal appears to be directing users to malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=forcer+mise+a+jour+application+android PDF link annotation
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/lovesewewewabipamolo.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/zojowezomopibuletibili.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/kujitafino.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/raferivorebomevefuxaxedid.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd7b5eb1e7---nudipijipolegipegezudak.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea39b846f---lifadijimutasox.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dujeresazapewu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nagulirexa.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/pidudegipewakinajaril.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/pepibefep.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/15dab9902c2936ad479327e7c02fbd1c/jemusazikovedoxopober.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/motozizamamo.pdfIn PDF document text
    • https://bawauang.com/contents/files/jitatewewel.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/pizimevojusewexevolu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/39330403049.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/rikagirejusobokipomob.pdfIn PDF document text
    • http://only-svet.ru/upload/files/86033461739.pdfIn PDF document text
    • http://mousike.it/img_ins/files/47621974225.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/66834341884.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/68671765581.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/80218540089.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/47813841300.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_off0000bd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 18668 bytes
SHA-256: d6d61362d3bd9b0b2f9222f36f99f10a968301f01273c574a658b4c3b68ebed0
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10884 bytes
SHA-256: b0dc7abd6032597cbfec149dcd1a551a6ad69cbe1bc632767fc6e4ad818d0170
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1