Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9e0bab5eff9a4e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 02:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 395d72557551eb43909fda879e5c3c54 SHA-1: fc5583fec2b5556575b86bdd17c23d9f4a5e3e6a SHA-256: 1b9e0bab5eff9a4e3e59d6a2609413633dfb70c7a011be20746e73f1b40398e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which are the primary IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=pro+tuber+apk PDF link annotation
    • http://bloomx.com/sites/all/sites/bloomx.com/files/49329504030.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/23e091d2f8cff3334d1315d36949f648/sogetesedalasobavedozomu.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/22997746541.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/16356566088.pdfIn PDF document text
    • https://aneri12.eu/res/file/baxivafavo.pdfIn PDF document text
    • http://test-immo.com/file/74597980347.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/zusigoxupejoze.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/fonexapuni.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/42060880356.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/9582015510.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/29727165055.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/531054981.pdfIn PDF document text
    • http://jawarakreasi.com/file/demidalesukokiruvirepis.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/55192199549.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161334c1319845---kaputusatatomineguvaj.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/04ca5d76a9b01a71cf62bfc5309143fc/27238514031.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lubadasiledikapum.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/54502876025.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/16213527741.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/xapewixag.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/84081076051.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/bigawomimu.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/kitugogibideraligixubo.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/16784965162.pdfIn PDF document text
    • 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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 18008 bytes
SHA-256: c15c3458f636ee1a2c368471e6e14b0c3ff2f12ce242cc5dbb8ad01ac2f2e64d
font_01_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10168 bytes
SHA-256: 8db97580574ca0fe1a363cef69dcaae8579f1cd65f59901090e30b4314b6cb67
font_02_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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