Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e6a0128c7646c0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 01:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2267d1538d7f623a6a44dd59427ae90c SHA-1: 99b6b83029d0a8840b4e7025d472fef9d5b4fb3e SHA-256: 51e6a0128c7646c073acb2325de6bc7dc4f7e724c62f1e947ccd343da39c1293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on compromised or disposable domains, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs strongly indicate a malicious intent to lure users to external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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
  • 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 http://fecoil.com/userfiles/file/bulededesis.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e678009a3aa3b776ee6e8d96d182211/jorukinexoduweveti.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/91790923826.pdfIn PDF document text
    • http://hflchw.com/upload/file/24771746405.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/13017971758.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/rotudofumedobav.pdfIn PDF document text
    • http://shamayachts.com/upload/file/xutakomuvo.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/38420634836.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ed93953919325e8e22502716d12548df/niputojerevujazometovu.pdfIn PDF document text
    • http://ahchala.com/img/file/48778513582.pdfIn PDF document text
    • https://kvzriu.org/images/file/62425592981.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/70f26da68a807a9d0ab10a52174b381b/vifedivakujafiwozufo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pifufigeruzazigexubaga.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/47516260982.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/67558505675.pdfIn PDF document text
    • http://anindecor.pl/files/file/6596772985.pdfIn PDF document text
    • http://lactopad.com/uploads/files/welugobegeso.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///27227574727.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/70475005614.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130176368fe7---meminidifarowododudaj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145254297f12---91997708821.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/33256521139.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d25764322d1f887aaa9231f81fd37b55/gobuvotip.pdfIn PDF document text
    • https://makenie.com/upload/files/vevujogivalojivavodorato.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/76046874608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=app+para+abrir+rar+androidPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10060 bytes
SHA-256: 27e08199467062de93b58d5f0e89ef51a97391dc5dff2c09381f5001ab7ed566
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 17028 bytes
SHA-256: cc953c85bb853ebba251d98aaec598a484e421d8954ce50e42d92914c23b933d
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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