Malicious PDF — malware analysis report

Static analysis result for SHA-256 511448c989c5593e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 14:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6598952de2beb543e335809a49e823e8 SHA-1: c494a2fcefdf4a41c0d52e5a26ba5495bd1a13e8 SHA-256: 511448c989c5593e28bb473bf451fc4d1287eb958cea4a8ece59b470d64df5b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=social+benefits+of+tourism+pdf PDF link annotation
    • https://dnmpaint.com/sdcc/images/file/demiwesusesonagogekopus.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/kosadavofuribivokisuvov.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612e721a52ed0---zibamunir.pdfIn PDF document text
    • http://creationart.hu/files/file/64820898192.pdfIn PDF document text
    • http://hotechike.com/files/files/fezokikur.pdfIn PDF document text
    • http://cl-pub.com/files/files/89672719176.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4f4b8f03---38025173618.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0d17f548538d60fbcde6510434f99cfa/38930483038.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/54770907903.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc09a291---safadotazefipixulumiv.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/gifobipuvuzi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/48841378278.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/59542059843.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/43645766084.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67d5b7c36---32736525580.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086633f0b8fa---kedavuxalem.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9derp5n5tentnuvl7udmtacu5e/20191878666.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/togifir.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b302be6ae---jezagulevon.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47fd603330---rudemifonewifo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429204636910985.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75764140528.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ce6ae288---10314683179.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/60949516813.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3d99e9ca9fcf2eac03acde915642981c/gumopafikaritexixuzidubos.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/6585729613.pdfIn PDF document text
    • 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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 11096 bytes
SHA-256: 33c826d3dac0d43087c2113fd740731bc0024c7723f40b7aa95cea3238f8c6b9
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 17596 bytes
SHA-256: b9d87e2dd01af47ecae6bf473de406b84fd1ca5ba245853f11a0f2208786ba4f

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