Malicious PDF — malware analysis report

Static analysis result for SHA-256 297270c0acd20946…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 15:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06dd86b5017b66f8247bfd9960909bb9 SHA-1: d414fe308649fcbf1bdf63f847a30d58ece99e97 SHA-256: 297270c0acd209469313671fe9526e659237ef20ce4bf4f71cca785b5a2a6528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to lure users to external sites. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=social+work+ethical+dilemmas+pdf PDF link annotation
    • http://nutrizionisti.eu/public/thread/risorse/file/dezinopu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gizukijokozititomesa.pdfIn PDF document text
    • http://asfalon.com/__files/file/bujejit.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612951c77d6c2---63824127765.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vadidem.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ba008a3a---pigodegubawarepudetokuz.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/sefomigor.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/485ffbcfcfc9f2b7e2b02f858fdf9bff/52881708629.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612d719ca5488---buvedefoboxanoked.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/26099203893.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27625575c---44486097587.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/os9h0qiddhg1ljrdtf1vr67b5l/diwirupa.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/mezofilasonev.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf4b22781e---44409282754.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/91438989566.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e174f633---xugujinopa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79ff0d6ed1---toviruvedewurukekojijef.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/jobonifak.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38ae345c8c---pugedaxok.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f0e827693d22a4d719a06dccf8ee0ed4/31496177637.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/45842270460.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/68mtqcmngg667ond4ejdopiqi5/67276644194.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/24271832518.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/51556113429.pdfIn PDF document text
    • https://chineseclothingonline.com/File/ruvebim.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_off0000b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 15432 bytes
SHA-256: 83a469efb61c1c19eb899ea8832cfe1868fa195b03afb9529b68afcb25b42c3e
font_01_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 11032 bytes
SHA-256: 040158895e48bfc11262d2a2b99d38e7de39b442b3fdcacb2ba663d980b655d3

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