Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f71b9cb94c6ad0…

MALICIOUS

PDF

64.0 KB Created: 2021-06-13 22:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a432740baa1fcc8d2f4cb4998875ba06 SHA-1: df5b0d9ba5b0711ef2dddc563fa2c713dbbb225e SHA-256: 81f71b9cb94c6ad09941f2fe258c70b898f4bbd09493d279da713dec011823df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

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://oniceh.ru/uplcv?utm_term=file+recovery+apk+for+android PDF link annotation
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9331cbfa7---90713960820.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/govisurobupoleburowof.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/69686403838.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7cb2478d2d7bce5e4ae974a3ae4baed7/zejol.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/rifobik.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fd424c4ff31dfaab591306026e2343d3/76296625009.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78eec7b22---bugubazow.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/87726715508.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dhi4kbb1oluqifl8bsen42kr3p/79669692018.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d14e5cd4b---90101481691.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/lekagez.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbd467472b9d43f5ccceb0edfc98aeab/ravum.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45c8d2d7a---jikipipuxenixa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1b60d314---kajanewu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/radigizelob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 5152 bytes
SHA-256: b1efcdaaa862571fe7559c2ccacf4fe10e46f99ba0062c810ae864034edc0e7f

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