Malicious PDF — malware analysis report

Static analysis result for SHA-256 98816438e48461d1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 00:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9aa712ff6c7498a22911bd5eadc1e835 SHA-1: 715b256e58b2692194846b24fff845665ea82e2f SHA-256: 98816438e48461d163f37a8b3ed404e7badd1911df45c6affa7ebb5b622b4f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress upload directories, suggesting a link farm designed to distribute malicious files or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://metapolar.hu/tmp/52365050696.pdf In PDF document text
    • http://garantc.ru/userfiles/file/zokimiranofojariluf.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fd9bc1a01526e301534f56da4ebb1e94/40950824085.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/83404073388.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210919050726.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee01f45016---nirupiwepupevojofagaki.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/joneteloduwuf.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/91132081700.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/85361917175.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/9805299849.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134940d51c9e---80979071657.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/xupedopazuwatinuwo.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/16917418520.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/49136181331.pdfIn PDF document text
    • http://atya.eu/files/file/dawofarutevozol.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307c3e3e42e---detusodagedufamakepefuvom.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/88216765236.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/bimememavewuvapurujavi.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/gujuzelokanumipivanikep.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091323590773499.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908025008522331.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313d68f9cc---1395652069.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84487984895.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161389ecac6e29---xasub.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51667770216.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/turelarudofevepatux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=game+dls+2016PDF 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_off0000bad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD0 10396 bytes
SHA-256: f7447d255a50f8c7dd02190809dbad06cee6d20a3273f16a95ccbb2ece48c981
font_01_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 16508 bytes
SHA-256: 7c3a5bfcf2ad091c14afe67dde4e4c25a763d4346e82feb4705a531b63a0f32d
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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