Malicious PDF — malware analysis report

Static analysis result for SHA-256 586519ab62917e18…

MALICIOUS

PDF

105.0 KB Created: 2021-06-28 09:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51956d9a2e51917fab4c65514d7e7b22 SHA-1: 50b717dd427c6ce44d0aff0662b575aea18e65cc SHA-256: 586519ab62917e1850c2b1ef0dbb311a86df960406bcf97d4edc0cc9c0b92faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=skin+picking+and+ocd
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/a8rf17ucc0o3ec3pnal1el359j/mabofigatoxurixajabore.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5b9827300296ed9b7dfca3230cd9379e/51787232903.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1debc4743d---nigutawal.pdf
    • http://er-trans.com/img/produkty/files/62684614972.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0211fe6181---mesilipafe.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd333b48f---60172100171.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca64f4d7b86---63795782936.pdf
    • http://www.bandungmesin.com/file/33452601073.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/p8c2fdrkk27e82lb2lemnq2fl4/71144584667.pdf
    • http://westernstudioservice.com/admin/userfiles/file/90036815916.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a5c2e4c4---67439907856.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85398155567.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b8aa5be0---vamekibus.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/75abb7686f8095a157bc5a99878375b9/87850544471.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5e28e929d7f4e2a305e39ed86650cbe4/pajanerukufofip.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc32bdcd8c4fa39c30e38dc32a56eef8/gepovarizofejen.pdf
    • https://mangmalungtea.com/userfiles/file/julav.pdf
    • http://ecologie-energie.com/userfiles/file/lifomapoxo.pdf
    • http://aaaexpressheating.com/userfiles/file/xalon.pdf
    • http://ideas4mypool.com/userfiles/file/reliximenovotera.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560eed6a53---21906190201.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/796f4b9ec32e9317175760607948ec97/71820716186.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1qfs5qlguirn0fftcpnqc3okc4/nenikuzenepowek.pdf
    • http://ciskmv.com/css/file/suxuromujoruk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001363e.bin
49c261402c844f045401b1897ee18c993c07269478575f8fa8b75c649220e1a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 10312 bytes
font_01_sfnt_off00014d5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5C 16792 bytes
font_02_sfnt_off0001656e.bin
7ee122142b88fa93303f050ca9f21334be2d3f08d5d4367328c9625e2b87b127
pdf-font-stream PDF embedded font (sfnt) at offset 0x1656E 19024 bytes