Malicious PDF — malware analysis report

Static analysis result for SHA-256 263663c8cefa201e…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 09:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52a328a09c637c06399fb0c5a8e42129 SHA-1: ec532bf1baedbaf69bdafb57e38eb733e4ee1d61 SHA-256: 263663c8cefa201e7dcdd17ed61be0c7007383effe2aa26c3cb980a8a7a0127e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The PDF structure itself is identified as a link farm, suggesting a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://finara-v.com/file_media/file_image/file/94160944609.pdf In PDF document text
    • http://hrdiborice.cz/erucom1/files/files/25608174534.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/76426072874.pdfIn PDF document text
    • http://zxsolar.com/d/files/vogexevugobiwawisavufeb.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/glvsmsl1h5n7bsv9cr81nagc37/poxew.pdfIn PDF document text
    • http://df-foundry.net/d/files/2475467775.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/tozogonuvebemeb.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e101f131f0---bogasose.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1234658eb2---fozelumodu.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210816024938368461.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/12cbf5d599dc6f85b56a850964ad4e58/41544232325.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/mubuke.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161216a5831d5a---zegex.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be39e000eb---45645341672.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/60493959528.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429022051579042.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/32641754351.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/dafetemolusajiriberej.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/39607683149.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tidozebon.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4a599726---91174586994.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4353fda4a67cd53a68cc75fe4c3765b9/37970990249.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073785b081fe---pifinub.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/wujalevaron.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3a4b1542e57634732bdb75276bfc5a0e/nolupusuvajisitepa.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a488741250cae88f5c05ac678b19a74f/penaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=matriz+swot+cruzada+pdfPDF 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_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 10572 bytes
SHA-256: 35ed2beeea5d62d5e4b882fac7c30e1ffb7e65cec85f51e12d0a4247a250de3b
font_01_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 18416 bytes
SHA-256: 8bcd222b9be47ed6ee934e7e442717cb039431e29a5c8faf0a79ed0edd1c45cd
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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