Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53489791ee2a7e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 16:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 519b98f4d36512b0f177526fe241d41f SHA-1: 27daa494f783b51fc74509141416bb06cf729b62 SHA-256: 2c53489791ee2a7e04604025d1317f68df72216a432d60ed617d19dff3c246a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The primary attack pattern involves luring users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/5o8kh65d2ovau3jbs5l52akti4/daluzen.pdf In PDF document text
    • http://smclassof57.org/clients/34860/File/72413769856.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/42617032788.pdfIn PDF document text
    • http://ashioke.com/images/library/File/81912100931.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/romat.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/33334489601.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943bc39bc8e---tulaxawuvezexo.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/saninomisifa.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/bozadaluzarawazuripowam.pdfIn PDF document text
    • https://ewt.cz/res/file/20665811032.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8a2978934fc1f2e66c8928444330af49/jidugurexikisivotuvepul.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901cb784f24---8886176456.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/42064934217.pdfIn PDF document text
    • http://hkwwta.org/userfiles/luxuki.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b827707ac9---35007058079.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/jarosigu.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/6690436824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f451679a39---sawirob.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a85b23d2f8---rabamugene.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4257a5b79---zuwijugixifelurafapezasan.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/tipiwafu.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/dd0201221e8c9fcb2d96d853fc4faa8d/84843159032.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/950f256413e8d5f2f40ebe162e643834/gusipetebob.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/pasuxitime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=william+wallace+biography+pdfPDF link annotation
    • 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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 11028 bytes
SHA-256: 386d905167ab20806e35169594a23599744ecabf171fe19404c4854efc0f2ae1
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 16296 bytes
SHA-256: 3be1fc675872194d2af210ec79eadca4357143ad116c333162e41e7266b892ca
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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