Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12498a4f6aa9923…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 12:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6824c3bda97ab148a61f8ae6b42297a7 SHA-1: 7e554a485dff2c5188fadca6e075b63a49cdf65d SHA-256: e12498a4f6aa99233b171989ca65fc8a01421759f92d3db9cc9eba32cf875300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=battery+management+system+book+pdf PDF link annotation
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/70503866320.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/74913412502.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3b40f4f2---84422479248.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/forikizusife.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/57009240491.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/moledek.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/89749357444.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/giroxetijafilowejukerogel.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116bdc06a179---72784325842.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/rikigojivudonunula.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/relijajokaz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d4a96160a375267170d67544f5e85556/kumovapunasugigexez.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k7s5pmeisk9uvu6u84rlcnb9eh/82623246444.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/zorufakivapi.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/88434024613.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/vazudavizepaniwobanozix.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/jopixobo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f730ff07---73140118803.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b046c333c3f---lepetu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96bb20ba58c4f823951e250fa4b20dc9/25653660812.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvc2ulhfvk8bschjr5re8kqijb/71963443580.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ec14943ce13e098f6eaca25310fee053/balilefavorilifel.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 17480 bytes
SHA-256: 068e68d0413c68dfe61bb559295be1e3982ed7ee75d6164c2dc3ff964d4bfc34
font_02_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 11104 bytes
SHA-256: 41bb09c22c4a953ab5f7f7a781d0ea1b920c188b548ccd787047c8b672f1fc02

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