Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80104515a5a6635…

MALICIOUS

PDF

62.3 KB Created: 2021-09-09 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ce3f61e66f8ac17e437b07aaa082c08 SHA-1: 58d85069b59581666a5bf5116ab3c23007895d96 SHA-256: f80104515a5a6635a837aa4a835cd08e7169514d3e77d2fcef5ffcfb401e8ac0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, likely intended to lure users into downloading further malware or submitting sensitive information. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7942

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 http://ourconn.com/userfiles/file/202109021014477623.pdf In PDF document text
    • http://rovitek.com/userfiles/file/sujopapemoxopuremod.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130532334e1f---86312888097.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/kogobulilek.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903183445.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/kimivaragu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25374e2aa---34359145192.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/47726089334.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/3582007574.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090310112359.pdfIn PDF document text
    • http://js-space.de/userfiles/file/buxodar.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/josudukinabobasolixe.pdfIn PDF document text
    • http://yepuco.com/uploads/files/wejosufibebip.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/66909564640.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/dexedubanosevibebonisa.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/jujuzugoleditenuramovat.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/minotofilolubakujuzuwate.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/lunaz.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/fogesibusanadujaga.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/kopufedebunumudivageb.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613695dc20daf---gosudadapefokulisugulafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=unlimited+coins+in+dr+drivingPDF 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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10624 bytes
SHA-256: 11ab774a337077f0f247492587db42bfdd9a57eb9b637e8267c4a745c1b6ee87

Open this report in the interactive analyzer, or submit your own file for analysis.