Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5b704bd8a17fbe…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 21:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac4a13fa6c102ba257fb7c3ed2ac56b2 SHA-1: 3f7fe68281c026bb54c6ee368665eb5c8f102def SHA-256: 9a5b704bd8a17fbe9a0a62f3ee4fc6ccc8c63cafff87b274d472fc3356c7eea3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to exploit users by directing them to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://partroyfuneralhome.com/partroy/assets/file/dadijano.pdf In PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/80034098099.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/jovawopulaniralakil.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/965408389541630760087.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lonesuvapibojufipele.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/zutisipirijokabisotoduv.pdfIn PDF document text
    • http://kaies.cn/upfiles/210905074644238786kizluc.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/41303714357.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/afca8cf36fff37ff4db21e829d0b9554/19374685788.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/82675633621.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/nureloluxotebeb.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/losugewufevodufagubar.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/xugivotefukut.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/nerinogibonokumovil.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/segubesozuvarixixolejusij.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/sepejaluzesebewekesunovig.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/15063483248.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/86557089740.pdfIn PDF document text
    • http://faradbox.pl/files/file/fogefukove.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fd8a1ab8a1faa70fb72278cfe9ac5a4e/mawopojet.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/41017543000.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3b75edfe---10703880160.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/lovaluparixojofujax.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/metekipuronogon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+cool+things+to+buildPDF 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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 17192 bytes
SHA-256: bdc198020808163b1de77d2a3ab4495bf3ed64781c6a0074e1dbe8340d54fcfd
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 10988 bytes
SHA-256: 8f82e9d3c4eb4bfb97d8e7467f0c3b51a7aefd0dbe7a232513b8307bdd04a394

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