Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d8160425563b5f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 22:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac2e7f9d00c1afcc55fd9bfc7c04ba46 SHA-1: 201cf8761fb41c2a76f7bac9c35f277f593c5bb7 SHA-256: a5d8160425563b5f77e03f6878aa9eb400368eca9d80a000457306f36745f42a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=higher+engineering+mathematics+by+bv+ramana+pdf', are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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=higher+engineering+mathematics+by+bv+ramana+pdf PDF link annotation
    • http://babyindex.nl/images/uploads/zafaga.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/zofumirosalulegejuxopa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wivuwawuzavinowolezobolet.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ee81ec9d---37073382489.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/126b506f5c5f4624b413b176bf31c504/85907145826.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/28948194135.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/sopetewetakupabaxebiw.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/863591b0b081461fac2f8573c4f50091/xowenufemobufuvala.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/87786732178.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wawugozi.pdfIn PDF document text
    • https://12waktu.com/contents//files/36489655410.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/65d95ae504f9ddf8af8ebadcda55e0e7/pewejegorezimasubi.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072735149291---147417455.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/surika.pdfIn PDF document text
    • https://harom.ro/files/file/8733566938.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/78719362922.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1e04840c3b8401bfd98a591784d1f118/samiwaremaluwavivexusu.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/faruridivati.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/16286117885.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/59900286224.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3142327db16125bd8a0a61b4cd7f926e/2591466262.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0805dc58c9d2f591593bfdaac711587a/46689282793.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_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 19488 bytes
SHA-256: 6221632556d75f952f30a279569ec95ad11f6cb5775694c02eba562979c24454

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