Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf25286ea5cd077…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 06:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 70a78e84a610fb8dbf4b717faa559701 SHA-1: 25433b7a40fcba4e9f27d21e43a27a18902790c8 SHA-256: adf25286ea5cd0777dee92bf0bc6e780853b1ee53a40720a8cdf6808e534860c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of disposable hosting and compromised CMS uploads for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610be98d2c48b---febititoxevelafadixakuxir.pdf In PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/46485897424.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tagenululikarekor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14ead9c46---79162929196.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/93948883960.pdfIn PDF document text
    • http://lobi.md/userfiles/file/76040209424.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/jozipotipukulow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b400f975244---piguxuxegebir.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ca8a907d---17727552555.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/30841838826.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/bdca1f4b67aba1e332aff7653a895045/26150340301.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0acce88f---52686813552.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/67726401017.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c73e06a64---2148975751.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/nawejiwikek.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a51ff2c6d---dobilawunumujorefav.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/17palj3ods63d8qed1efdpat63/90025803045.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/58334405874.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/rinitesexuwe.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/mojeguxuvojodavowemepiva.pdfIn PDF document text
    • http://greenbrier101.com/userimages/98267277137.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/77475617652.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/95dac14a9ba320051ed57fa4c2c11c8e/50072682988.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/mevatarogodafipimasoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=essential+mathematics+for+economics+analysis+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 18672 bytes
SHA-256: 1f4da8798d4615150e0959accc64bed3697487a664970fb8ab215d4072e4ece0
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 10980 bytes
SHA-256: 28290f61f4d0a6902b16a92b39b5d0fd87ddcfbf998eb5c46b69b15c723f9597

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