Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa566f5758002869…

MALICIOUS

PDF

139.4 KB Created: 2021-07-15 23:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a8c5ecffe40b346fee40a1ff6693deb SHA-1: 9e5382d003bee8b4cf09d693ec071286cc8c6976 SHA-256: aa566f575800286932eac701c41de3bfdcd2bf4a26abbcb9c95dc72e93508394
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document likely uses a fake invoice or payment theme to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jpnod3mcqgn0ka1hnls11itl3q/rejiseru.pdf In PDF document text
    • https://noddy.nu/images/file/dejutamasufu.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/moxigavozavatasuwemi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f2a61e21---46355557719.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859d14267b---rilevosufafopukuwozepa.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/pokudazepavunelate.pdfIn PDF document text
    • http://humanlitech.com/files/files/41633479837.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812804acc4f---30203791070.pdfIn PDF document text
    • https://actorconseil.com/files/file/17058511394.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607669b002a8a---waliwiporozuliluzazup.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96095cf6c---nubajokasezurebukubise.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b848f7d85d1---10739364546.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kigofabalinu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c874e2bd2dc---nedekatanizo.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/gugomaxito.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gobipufixafupuronage.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/datisoreko.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6127b5f5013dccba77198ad68fca5708/noxage.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761e18e59d2---mifisagikepasuxewagugiji.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb5fe356d5---defasav.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0621a944---nuvelowobidujefulomedoga.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba6da0b40---mopewewamamoboder.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c33eaf1203---pubomegaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=recognized+meaning+in+tamilPDF 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_off0001b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B29C 24084 bytes
SHA-256: 84dc561c28656966e365cff465ec3b2fe802c87091ed1e5f98d633348b169735
font_01_sfnt_off0001f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F001 10548 bytes
SHA-256: 91a3f16bb82dd1d430831cbadbc0beade81e52cd5c204699d61b9944f6e85a34
font_02_sfnt_off000207df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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