Malicious PDF — malware analysis report

Static analysis result for SHA-256 6394b04d46365a89…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 09:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f779990334c1f7bb2ab1029d16e1444 SHA-1: 699d76f0640280a5e2669fc7f502b9e9c370a681 SHA-256: 6394b04d46365a89cfb48c14aa123673e78b2b7c6b8b6b686be836fc1135447b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the PDF structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=it%27s+your+birthday+you+can+cry+if+you+want+to+drake PDF link annotation
    • https://publicbridge.pl/userfiles/file/tadutot.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1adfea864680a603184df2ea3e92de90/99141097047.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/juredifobovomusirisavava.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/pavadejuluzaboxabaz.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce1caf7a1---vilikifisor.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/76953123337.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076e62054631---3681070480.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/58561799966.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vuxalugoxonuwek.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854482b2ed2---2110794059.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kujubaferavamof.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bigasebukebekusuxir.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/62340678824.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/40713328212.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xowagirowep.pdfIn PDF document text
    • http://canadanur.com/resimler/files/risamo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mj5q9fqsl6b2tup8702j6lke0m/befuzos.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ed8598f0bf7de21cf53784e51430c0c3/mizogajafefex.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/69205736139.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/68124977625.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d78b382e59---rujuxibelakisafumef.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/tapisalitamebufumiz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095b1357b64d---tobuxakanaf.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/fawigetaxipotiluzegasode.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_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 11044 bytes
SHA-256: 3fabdc25f50b0fd9b11f831208ec683738465cb1bf31cc1f328aa547d26a77ee
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 19400 bytes
SHA-256: 324be9550e793778865320cc1874f84e501688ccb52876e88765eaacea032e44
font_02_sfnt_off000143df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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