Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf1e579235e1dfb…

MALICIOUS

PDF

97.6 KB Created: 2021-07-10 04:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f757a314eb4f014bd96e712614177cf9 SHA-1: d5f799da3a9a391380d8a10ae1bb7b2c818f0eb8 SHA-256: 8bf1e579235e1dfb307aab2aa5e210536a4c8ad24d9205b8ab643fc19aea3680
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b783a731a---lofajurobovejosegej.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc1ea9c0d---83366650324.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ab93987---41563054865.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26cc4feb0---goputilarajezabu.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/98304074372.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/91510166711.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/dunidejuxepexipa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73dadfef6---sotakipuviredos.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a043a1b5c0a---ronoridatofadopuje.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/55574574176.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/29428297030.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8578f312d43cb0164ed6103db3d34929/73072203594.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf54d6234---417055559.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/7dffa9b681b86fced02e330dbbc5b08d/gupatasepeti.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e4rpvq0smlep8ja7sq884cafsq/37638399189.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/91628528945.pdfIn PDF document text
    • http://promador.pl/userfiles/file/27165094997.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/77085118641.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4ca156c2511c01db7e059e97ca78af52/25171924944.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210708232240.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pelalejinofoxibad.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/247a226d8f52bb6c6e5ce736dd8b85ad/82287645197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fade+away+fromPDF 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_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 18264 bytes
SHA-256: a2085f1bef98b4bdf093dfc00eb1ecce9e1b943eea0a645cc39cb10d62ff7190
font_02_sfnt_off000162bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162BB 10184 bytes
SHA-256: 7c6a322414abb0c308ff86901a26ba8b0bf14f22161d1879335be4608ab33af9

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