Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9da19e500a6f74…

MALICIOUS

PDF

92.6 KB Created: 2021-09-16 00:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: daf5fe713e402a92446b55698e9cffd3 SHA-1: d4ad1f2b031a6ba85f649e689dbaac1842e5be84 SHA-256: 3a9da19e500a6f748061685d33c3f9da7adb1913241a180442342a248b407bbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=gta+sa+android+save+game+file PDF link annotation
    • http://mim2010.ru/userfiles/file/9074980681.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/35629201845.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/7354713396.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa0774144---xosepozupexidik.pdfIn PDF document text
    • https://slotpt2.com/contents/files/ragokerevubevev.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/86602267147.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/remujutad.pdfIn PDF document text
    • http://grabnerestriche.at/wabalufemabokigit.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/66599100826.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/tovazimepobikiw.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lopovemowitotikomemap.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/42683038884.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/74383860795.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/muzewefujila.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109101024285405.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/62228285558.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210911141055.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319eeb5b2e4---68890316787.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d35a88b5---punug.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/tilemexoxuzorakedopowile.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137940eb167d---vajigekajug.pdfIn PDF document text
    • http://zenithmetals.com/files/zirisuwaxet.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/mexaxivisapuzat.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/64752366326.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/44472408.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613497a5c5b34---kuzulumim.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_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 20688 bytes
SHA-256: 9a60e0d5a636e14ced64bbbeff7f8163b7cfd0e0fbd34b349b5c77118672a99f
font_01_sfnt_off0001340b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C22 10800 bytes
SHA-256: d0df0d262507e8b6dd02e80bae72ef7ee2b2da411b54ff7b005a408bf0d971dd

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