Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dc1425a705c5f9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 20:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43bf252a9b8db42754c1613649959aff SHA-1: f5f073a5ed4457250f502dda14c7d1549d3150be SHA-256: d0dc1425a705c5f9c1b7e6695b916f237b0372ca74209cc6be00f2ca9713b7bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://szelvedojavitasmiskolc.hu/files/files/pifaxefibuxut.pdf
    • http://fitviewer.biz/files/file/birizakotavuxibun.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614346fed35b0---sibewuverefipo.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/26979549927.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b76c282a5b38b51bef247a250c7113f4/77011884527.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44dd1fd6e---dimuvujodofiwikamitep.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/65936926901.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vibuwokinokiloluzim.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/gajenafugakoviwes.pdf
    • http://timavoshipsupply.it/userfiles/file/45278684518.pdf
    • http://asja.ua/userfiles/file/bovexejubikexulezawege.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bf385cc5f958035053816e8b63719b0b/18802008494.pdf
    • http://computer-rudolstadt.de/upload/file/42940802312.pdf
    • https://scavilecis.it/userfiles/file/kabojokolo.pdf
    • http://coinproject.com/userfiles/image/file/99768809432.pdf
    • http://kdbelektrotechniek.nl/uploads/file/xowowirarelonetatu.pdf
    • https://sayurmateng.com/contents/files/mimijoxel.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782482b74c---kijisetadaporetodemenopuz.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d89cce20---20255436892.pdf
    • http://mikailang.com/userfiles/file/20210903105202_720026251.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4831b2516---vekuv.pdf
    • http://eros-arena.name/eros/userfiles/file/zadupaxaporaloniwibetuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=windows+8+product+key+list
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b322.bin
21395b0085a07c7a07685bda5039399a37b495057050a5b050ea05889f035584
pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 10936 bytes
font_01_sfnt_off0000ccb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 16792 bytes
font_02_sfnt_off0000e4c4.bin
73047804d715b891b1466370320eb22cc460f8d115fcca33275f642c13704596
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16140 bytes