Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7e001e1bc7aa12…

MALICIOUS

PDF

82.5 KB Created: 2021-08-09 10:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fbbda15e6b80efa9d3af8cc73c8272e SHA-1: 490aad337794966277b760a80b7e22c107db6e12 SHA-256: cb7e001e1bc7aa1247ecb46f65d6e8f3c74ab331e725ba7da92c8138bdb4e73c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous other PDF files hosted on compromised websites, a common tactic for phishing or distributing further malware. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://titusauto.hu/kepek/file/67931391755.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/rusuwofavunenawigogin.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mcb9i4gq3nrv2107rhpgh1gaa2/5678375814.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/40623877e80862fc9d60be606a8dc25b/jojewedin.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bd255c1010df8b0530d8f6dacf1c02ba/8329127068.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e5934ae3d---mibipitanepifigokawanad.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/147007517f02c77f98de62970097a24e/sozafufefinudusonetufolow.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/262e34a13cf23674b00a5c89258f4c6e/73102230129.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vkqd84f4nhg9vlt30tbbk2f8mn/20508450324.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/sulowemoke.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ap31uah2ldun0nqplmol64it5s/majobopaxagu.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/61750938564.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68c1821eb---52672547889.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2bd5ad17735b90787ce01560eb594be6/jarabebibarepaze.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9ed3d5450dcbfd82aafc1ad1f423e1a/lojokaselowo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1daa2d88c07d01ed4a25209402a3a9f5/xekazinexenebud.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/18474092459.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/kadup.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/49695551632.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/molewinetuxaf.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/73649440440.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecef31c37a---bibizolabirizujobude.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qpe1kn5qq5nnusa75eolagr975/tomajexi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/16039866184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chapter+18+reaction+rates+and+equilibrium+worksheet+answersPDF 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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 16900 bytes
SHA-256: e0a167f8c9bb70652cae2278eca991ce41f3c321c911d27a1ae8d1c19e66b4a7
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 11636 bytes
SHA-256: 868c18d4fc91ee2d138759117dc87986897c931c6536db186811692c0c505635
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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