Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b70fc2328039726…

MALICIOUS

PDF

82.5 KB Created: 2021-07-02 10:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88c835cf6bcf7debdb0516c6f7d4e199 SHA-1: 87b15664f4eec43d82218f9190772ef381c49066 SHA-256: 7b70fc2328039726545ea6fab28d539e5de33139c79b931ed01c4baaec0be112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/73ea93af2e490eea4982f32a83433272/16759157211.pdf In PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/1731705934.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/39livvqfi337urmjsb8b17dei2/tutitefitix.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/defenokupo.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bdd2jqn62ufeqfbduudfhs10e0/89585767265.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0c28f32d1---tazala.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/83d92f7c2ba4ab9fc42f69d19aa97788/lisutilefokulogelitepag.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39d5c87c4---44927449891.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/da01ed1b7a3fdbc7be2d44a409701934/folevopo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac736fc5b0b---18046886644.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/latizefuvafora.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b559e9d340a---16031241921.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/071e72c932341b914d3d3f8f8007f86b/budulaludakuxeb.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/68630172527.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/80996708713.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cs2gtm7shpaln4vsoirjogf9j6/44558451088.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vv74r7q2g9ko5ghjophed2qruk/99709185185.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/17497636164.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bogotimafujujulovafeze.pdfIn PDF document text
    • http://promador.pl/userfiles/file/bexesemesiz.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/begupijiwugukopabozoju.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lexif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+billionaire%27s+passion+by+alexia+pdf+free+downloadPDF 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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 10936 bytes
SHA-256: 1ab62cc1345ac417f05f8668858dccc83bcd198b287d1092dd018f491a858d20
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 17372 bytes
SHA-256: 662f23413732ffeeb009dd665d2fd95385f5bc61b4ef423c3ee91e1b6503d95c
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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