Malicious PDF — malware analysis report

Static analysis result for SHA-256 769b3d0a52ae03da…

MALICIOUS

PDF

75.5 KB Created: 2021-08-21 06:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba9d7d8377f7ede602069da57ae3680e SHA-1: ef2e1d48e6537a5f267b1aae34c0947547189717 SHA-256: 769b3d0a52ae03da54532852795ae73f0cd99cfa700fbbb47234b031937d66c1
164 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. The presence of embedded JavaScript and a large number of external URIs, many pointing to compromised or disposable hosting, suggests it functions as a link farm to distribute further malicious content. The primary attack pattern involves luring users through deceptive links, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kor-ra.ru/UserFiles/file/6060799716.pdf In PDF document text
    • http://keigan-productions.com/clients/863431/File/73662974649.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23603ef0bd---tetetugotagubuvo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6886cd341e99e02bea651ea6d179fcaf/sorusosaw.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/43914903732.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/fefisadavuti.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5e82958e---nujoxotem.pdfIn PDF document text
    • https://amgaa.org/temp//files/pajenunadisosenuketixax.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/sipagetekanemimigiv.pdfIn PDF document text
    • https://hoongnau.com/upload/files/96483469598.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/fedegegufaxiterarokilosi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/42364754910.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kinararopexumaz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c5b157e1---borulaneborijutoteru.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/410b0ab1d88225dc2d9ffaab0addab35/83380027915.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/554fa4d121b82a92c6c2414c36083bb7/dozin.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/27616722151.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1f46c81b672ae50127917ff45eb25a6c/vilogizoropozopisoma.pdfIn PDF document text
    • http://gptools.net/userfiles/file/bogakojatebajur.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/90469589981.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c12985431379262c6fe0463e2b529d89/3509733888.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/23416020375.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c8a8c851---baxojoramubunoregate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kuta+software+infinite+algebra+2+graphing+logarithmsPDF 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_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 15504 bytes
SHA-256: 828b41bcfb173b305ef14496046c302c1b6b198c09250f0cc6adcd7aedead6d3
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 11240 bytes
SHA-256: 08eb5e73c8cae6fcf10e67ee8373557610c37b13ab6f51e33d0c16944febbc1d

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