Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb05a2cb650f7908…

MALICIOUS

PDF

95.9 KB Created: 2021-06-27 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ee9f46ec253d5deeab4b15f4ba9e5e8 SHA-1: 72e483053c1c66e41c94f0d4c9639b35d46b5bf0 SHA-256: fb05a2cb650f7908cd981c9d62d60547bc4c91883704b9ada1073366c1eb197a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://webursitet.org/Files/file/55649838228.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/86736f4deeec73d2fc3676c979bd48e0/79235714089.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2nget6c330vsj9juidmtctk7q0/xirenisozadasesavinufejo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795eabc0496---41932379913.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef09a4da3b---pibukejolupixile.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jegonamezefelivajuwu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/wefiwobigazoruwatidenozin.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tirobapow.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f48d35c2c5df332647b3cbdaf4848db2/kiwogupeladuwejikenuvesu.pdfIn PDF document text
    • http://mytekas.com/UserFiles/file/fixavodajuw.pdfIn PDF document text
    • http://msiutilities.biz/documents/geketetevum.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087203798c6b---vowilemofiveki.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088639f688cb---vesogezonuzuxiw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5540061affcee7938431b4b36b2e187c/21540473451.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b8f2kmqpninqucbupqhjmg777k/japewimuganesijowiv.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d216375eae---38556695650.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090924abe2a3---zozujewalegubuj.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/38524485471.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/a0mbijsjprocapmc3i3p8q7bj7/pirikikajetukikuzilomi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fa2dd14b---36908912595.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a0d7133b---38778563657.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kotavobanizevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=state+the+faraday%27s+law+of+electrolysisPDF 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_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 18864 bytes
SHA-256: 9d8c0ca9fc9d9b3b099f12bed72146c11b8f7d56feabc1e738a0c8ba5772fd93
font_01_sfnt_off00013f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9B 10780 bytes
SHA-256: e7c6141fe1055e885427083ee385b188f3148755a7d94f8d056c60b0ac646bfb
font_02_sfnt_off000158ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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