Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8c2d91bf42c047…

MALICIOUS

PDF

81.8 KB Created: 2021-08-22 08:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b14ad5a71e935de4d30ec9a5696aed63 SHA-1: 1074982a69061001fb8f43a054bc695375e347b6 SHA-256: 0e8c2d91bf42c047d76272934394fd94269229e043210cbe2130a6376d994537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures to phishing pages or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d512e37e---20112622651.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0255312878---94388077928.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/45449191159.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/dewovononelamugowine.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/sumir.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/14643997515.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/levepexijabun.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kiwikezuxasivewitatukage.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608999373ad72---70223706902.pdfIn PDF document text
    • http://grimastone.ru/files/dunobasojewamubotudamar.pdfIn PDF document text
    • https://digireg.pl/upload/xaxep.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/sogijudotumunalemesumuzij.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/83660218989.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2431f0fdd83abf7856c325f8312af333/47073868949.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292357181965.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/sedatodizirirajakek.pdfIn PDF document text
    • http://ezibra.pl/upload//file/60598354264.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb385d79d1---4106151433.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8bquepqp3i8t64s6f0d0gd3ilv/1548928437.pdfIn PDF document text
    • http://arablift.net/userfiles/file/66033884038.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3afb3c786---43956788844.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16096f6bccd710---sepediso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dunkin+donuts+promo+code+uaePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d28a8882---minubobow.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10820 bytes
SHA-256: 7909e530141c2576e589a27f773033434c3d06a37426ceb12c9ca0a93591069b
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 17092 bytes
SHA-256: ef06cbc698f20ecba106fcb76a05aef33656d3aa0bdc443d661f3d400f405de0

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