Malicious PDF — malware analysis report

Static analysis result for SHA-256 8906b7a555b96044…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 10:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f654e1605438d07319bd6d70f83fc52b SHA-1: 18416d6d0c5e1842d76c9b40b9303938724fb5f3 SHA-256: 8906b7a555b9604474ba577bb4096188b5a7d59475dc5b42779846558d4b25ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=jelly+truck+unblocked PDF link annotation
    • https://greenboo.vn/uploads/files/61357085333.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/69425360872.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6aca6649---45923092898.pdfIn PDF document text
    • http://signauction.net/userfiles/file/33415735640.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/35054347251.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/58225409438.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zajeselaxabipubanurog.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rasilunadip.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e139dcf2b7---44442860795.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zotebomekozidugimute.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tunebefewaxonula.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/77316390814.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/lasakagezodolanegabeb.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/33932533893.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210906_165040.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57947175346.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/mivijemisav.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/10696840160.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/sepixofelutawa.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4f0af28a---womirosoluzemapazuxow.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/sixofidojuxowenefegew.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300962e05fa---gadebix.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161354d79502b0---veretiko.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/dozovaleworubenagul.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_off0000bc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1D 10376 bytes
SHA-256: 82082f15bde6abcd938a3e4c3d4a8cb1eb7ff840a3982ef513a30b5401ff794d
font_01_sfnt_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16588 bytes
SHA-256: 7de3607ce884f1ac385cb9dad9f625f576fd5cd8277aada0caa3f37672d3baa3

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