Malicious PDF — malware analysis report

Static analysis result for SHA-256 83108750d7ce9ca4…

MALICIOUS

PDF

91.6 KB Created: 2021-08-18 04:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ba919ce97f4c4778a8402dc11aec205 SHA-1: d150938659373af45809156822416fc402814cc5 SHA-256: 83108750d7ce9ca4e8e493208468a93957a706aafe2c7eca5c38b9159dfbf9e5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of hosting numerous links on potentially disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://shreenathtechnologies.com/userfiles/file/moketazotakekebol.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/27abeabb8707f3353bd49025be9aa192/2058292392.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/45fd1d5c3f8a5bff033a2b1b1825e9e1/33706516592.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/48e844ddc241697bb3f02f079bbe2560/99925350658.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/e32ebdefb550fe15365fc02977120f4a/tezefabeb.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/rilabuw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jetukutaxanowupuwapala.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/45fa7d9aeb30b5af25a6a7586bd46912/lulubusapapigixukupil.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/2044590557.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7kkoah0hqce83a3v6qonakr24g/pidifodovarajewalodatole.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0a2e54a24a02810a70c032e88a739daf/60895532346.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/50367431000.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/rojuza.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/12c48bac41e84d33d5bbc3cdbfaf0978/popebedapave.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/5592545189.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874520476c1---37970805109.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c2fb15727d---49352271860.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/mevizosakufu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/28044967115.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/74577226923.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607497035b7a6---pufejudunuvewolesazumole.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46361b539---satanebapo.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/85340834805.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/lokazokuxomejo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/bejekowodedojapoju.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/50cce940aa6e2cb2db4179990aab5904/xoribazasupavosurim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=character+bio+sheet+for+writersPDF 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_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 17204 bytes
SHA-256: beed327dc2beadafbb95544cd2675ba163718575cbb31e5e2d1dd65e48f3eca0
font_01_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EC 10540 bytes
SHA-256: dc4ce6f548e96b30e9f78102a9f182a6f6574d9ffa82c8b884e8536b2b6bd048

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