Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffff5df4a6e6a9b…

MALICIOUS

PDF

90.4 KB Created: 2021-10-11 15:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 023152dfb1bfb10432d3f60624c1d62f SHA-1: 63cc6d145647d3ad39a10ef8f3361b6dd7f6187f SHA-256: 7ffff5df4a6e6a9b5523cfddd1d6bc31c5a0bb2f5fb2cf26a35d57ec9850749e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which are identified as disposable or compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://crystaltrade.hu/data/file/84444957654.pdf In PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/20187475912.pdfIn PDF document text
    • https://ccenter.ro/userfiles/files/57527825976.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/69230042910.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/58357836341.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/62261854208.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210906125958.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425c8032473---suzul.pdfIn PDF document text
    • https://hot-pol.com/images/file/lituben.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/48745527155.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/doduneda.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/kabavibe.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/puzebigag.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/kalufudobujifute.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/98871664074.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/vaxegalegewigoritoset.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xeled.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e87c73ed1e1e0c845119570cc1c055db/kopotepisodo.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/95492643363.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/47702491209.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/79396525349.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/zibewi.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/53591314498.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1c4d5ab7011e196bdf1c8d5b7c38f525/92260010676.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210915154454.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/72110702059.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/kogelufajilupazufake.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=australian+mathematics+competition+solutionsPDF 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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 10720 bytes
SHA-256: 5c4b6d13803bbb9dc52dc6e794d1c54af81b12eda471a21ce26d7d9fec484e67
font_01_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 19528 bytes
SHA-256: 5b630d658f842f0e9a432f6e801bc1d0aa1b280f019637b4a26319267cbc7caf

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