Malicious PDF — malware analysis report

Static analysis result for SHA-256 65da65ed354b3562…

MALICIOUS

PDF

75.0 KB Created: 2021-08-31 18:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a487d1f0c87bea8cd63e20a2ddc04818 SHA-1: 6024232d58190652e25feebfbbd51e354542be18 SHA-256: 65da65ed354b356294706f36fc8ce40ba5cddb4b54c823c1c1559a2723317905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The PDF structure itself appears to be a lure, with the document body being unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/b1a47d137b486e6ebe79b885634a06da/52639016716.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddbss71qfn1vbvh9d7uequ7vm1/melobudakolo.pdfIn PDF document text
    • http://m2m2design.com/userfiles/luxelilatuxofijo.pdfIn PDF document text
    • http://araonline.hu/uploads/file/tipelifutamupekilepiko.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/1fe231a0aba91137fd72078f125f33cb/63623806494.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/vajunufarukukulino.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160741e11a8ace---beretexisevibasem.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/29970895045.pdfIn PDF document text
    • https://eclearusa.com/images/file/82090430087.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92f7169bc---77854838697.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c89d6e8a3f640d1dcd7c0ef269955397/domefamufisiduti.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/29195662704.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c129cdaa90e---4723139694.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/79548339896.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ad35ff34d602aef7ace4281f24d9fb08/jexigenivek.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/54400185659.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/nonemubija.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/90183577175.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e17bafc3---93234314001.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607892237b10b---64495296007.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/42995210856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=we+are+going+in+spanishPDF 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_off0000c181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC181 17448 bytes
SHA-256: 0b77635f316beb3ba730b00f14975afbed25a5bac652ab079bf02a9491c719be
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10380 bytes
SHA-256: b4a830467c453cf6def7d990f3cc81b78c0a29d24be587d0c6dfab8ffd6253cc

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