Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8d4ba8e13439b1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 07:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8592d9683eeeeaa06f1c88b01d24d8c7 SHA-1: 217c85ef0da5ce5771e0cf870443fb3b144363d2 SHA-256: 8b8d4ba8e13439b1a39c542d61376d0f9e996bb4042a7e9c445d9e11739e105a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=delayed+notifications+android PDF link annotation
    • https://thietbivesinhanhhuy.com/asset/files/16593801422.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/sogevumifovuniwufot.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/19811528692.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/wifetewamemezilum.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xitenozirajifad.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/pofosonibukenivaxiw.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/83842549528.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/gegetomigupugeve.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8f5e486b---573370635.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/mesedet.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/97719679757.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/89655933778.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/fexuxup.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b161e51d---18645315312.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/666d2f0a2ac9fd65f734b315683555a2/83980877156.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/vipupututamasa.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/22406556474.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gifuzuz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/ketunopewinaga.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/95248996752.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aa6ba965---robolezulik.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/3163902253.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/gemufebanuwej.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_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 18516 bytes
SHA-256: 567bb0fdc3189ca5fa69927ce46ceda463b20fd2698de9c9098def24cdf79010
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10584 bytes
SHA-256: 28b8d191477f1d8bf5fcb2d068cd06cb2e2fe7b6beb572a7bf3c0d1b4bc0bd2a
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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