Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7ff9bfdc08828d…

MALICIOUS

PDF

64.0 KB Created: 2021-08-27 21:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 581ae77e4d3483ff4680f94aadff46a4 SHA-1: 583bd075110bd1548ad03f371c678bcf868d09dc SHA-256: 8b7ff9bfdc08828dcb62b89f92c663e650d221dcd36bd0ab49a618e6cd812dd0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7836

Heuristics 5

  • 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
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9e0c05d3---wixaxipepoto.pdf In PDF document text
    • http://nensi.si/upload/file/45480228440.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7a6c3b8c---rixuzabelanerakop.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/mojewajipajogifinoja.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/5486350718.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dewadetekujanix.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/i26bggvvvqjk5sflcgjcg2cqku/kixuvasufipalonogumisib.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaca7e8473---zokijinapumejezito.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/25444735226.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/mirovawiwaletasurenek.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/74460622183.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/48503874483.pdfIn PDF document text
    • https://kawanmto.org/contents//files/damepinizozirapu.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/wawefekokoxitudade.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/dekebonegulusomaripep.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328fb86acb---velipekomuxizazagipawebit.pdfIn PDF document text
    • http://xsjprinter.com/d/files/nirabebidelezawukajilu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160faba288a39a---potupivozibibilevux.pdfIn PDF document text
    • http://deforma.it/userfiles/files/leviretixovib.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b8413e20cee091938149cb2ca507251e/82791291777.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/81629997495.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5dc41ce35---17209516711.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abaf01dda326d69d1c1539c2f5bf14db/zopubisawizotaz.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tebosiva.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/gegivominamogex.pdfIn PDF document text
    • http://shahgrp.com/uploads/41980053665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pilot+mountain+state+park+campgroundPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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