Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d264c26d75bdf3…

MALICIOUS

PDF

89.5 KB Created: 2021-07-28 01:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9e68d8c5b362465ee5f57e4bcb01ab0 SHA-1: 60e17556f4323986176b87207495532af78d6788 SHA-256: 21d264c26d75bdf3fcddbfc5a6ed4b917953fbe2cb07c3816206543111a2f261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b7a09cee---70157960413.pdf In PDF document text
    • http://dralituncer.net/userfiles/file/xifazi.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/41fd6a8eafbcaefc1cf57309a381c4d8/39283762703.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0959c4092a35e580bce55d513feebdde/11854419007.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/birup.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a8c152812---51170093613.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a68c56faa---daposuf.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/lukonopusuwagoka.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d90ca6820---10486300598.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xazosetijulufikameb.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/desezasamutokofezojiwixe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/66286236576.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/14403471848.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/67463521872.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3edb7692796be12c51a784e222400ed/78323968005.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/bajusivexifusedaron.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/gekomigokivewuxuwuli.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/66387710220.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9c33894de868d0b544c6883b3d4232aa/radadu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/taregubabebobofaropikuzi.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/tuwureraxetojafirer.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/ninojetinuw.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071438fba8d1---60038775681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+programa+visual+foxpro+9.0+gratisPDF 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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 18496 bytes
SHA-256: c49c204a3ed536dd663bc398cf2c8e331124f42844647c359c64ee1c2f49cc33
font_01_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 11344 bytes
SHA-256: 9fdf667704eea825cb1aba51e629836f30e53a0b652d121281d4702307510105
font_02_sfnt_off00013da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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