Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa8139169ad7408…

MALICIOUS

PDF

75.8 KB Created: 2021-09-25 14:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 396a63507a40f30c3efdbb3e6b80ff83 SHA-1: 94dcff79f961d4f186e09e53fe3fc9d9ecdf48dd SHA-256: efa8139169ad7408c4ca9be8dbfb057a21ba83596923049749d4d8729c11f8f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=road+fighter+android PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/94d2443144018f76f3a0bbff4de49c4e/95110857547.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/51436391469.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146045bda82b---nobapadomijukefebe.pdfIn PDF document text
    • https://jagominum.com/contents/files/bajexe.pdfIn PDF document text
    • http://haki.vn/uploads/files/6745755797.pdfIn PDF document text
    • http://theponghop.com/upload/files/werusod.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/gojigajetuxekasesirawege.pdfIn PDF document text
    • https://soechi.net/userfiles/file/8392037043.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/46249559940.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/11353979009.pdfIn PDF document text
    • https://oferta.lt/i/File/dogijumojoriz.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/26732466221.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/befadumibiritexo.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/migumubegogej.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/nunisada.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/78596336085.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/modufifalemile.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/visakuravip.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4e688724fbf9a8d68313bd041f62d16b/62057725730.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613428a800ca5---90073472930.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/36859190098.pdfIn PDF document text
    • http://home-plast.ru/foto/files/motivuzo.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_off0000ba76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 10464 bytes
SHA-256: b7e0fc2e4d757746a812b1389b9ac1ec64ee49291a7ef3791e3c7fbac5630064
font_02_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 21964 bytes
SHA-256: 1f86b5908a9752702c67e5461d5e696889ca1040e61115f0e7c986f827a539f0