Malicious PDF — malware analysis report

Static analysis result for SHA-256 9690e0f17893633e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-25 14:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ebdbc69eb0ea3e0f255b1c0351e456a SHA-1: 7a584b114ab85be1674b643ba1ead510a1cc069f SHA-256: 9690e0f17893633e461d8e411575f20f5b9da985249e7f3f7a1e5601147eceb7
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the link farm suggests it is intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/diwuwakovivefexa.pdf In PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/44444454351.pdfIn PDF document text
    • http://runhouchem.com/upload/files/lamoxonobof.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/xusovasokidiwum.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7acdba01b---nijapolufa.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/38356764910.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/topozatiwebituvolowinidu.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/92719751981.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/54cd324846be58c683c1ff3a1a10f9c4/tedakonalagizisajetum.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161495a459caaa---zupudo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9f2dd7d4---97727227548.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/397732072.pdfIn PDF document text
    • http://newo.ru/files/files/mojenisagetowusirugoge.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nuzeburoxid.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jagadomemezawekolajodaw.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/dagakomi.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/zesoxifedepemimupiku.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/lubikamuwokedimiri.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/dimegazinisowikurimo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136d58d3f7ac---wanatolavefaka.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/guzug.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/patuzuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ramanichandran+87+novelsPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/figatajizejedud.pdfIn PDF document text
    • 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_off0000c301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC301 10908 bytes
SHA-256: 698ebe105681d4fba247df21d50b14240ccb2fab72ca08e5566a5425e9bf5183

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