Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6f01f6f2d8ba19…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 11:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af364b039cbb22855553e6fbcf74b0a7 SHA-1: 631b8cb887c2261f8d87dce44ecfc91edf006e34 SHA-256: eb6f01f6f2d8ba19d29c93a47fec4d3f3511bb920638de2d90d55754efb18320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on potentially compromised or disposable domains, masquerading as search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://sofupingame.com/calisma2/files/uploads/61245270270.pdf In PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/watumaseferin.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/69395704864.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/47351946093.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/21405341248.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/nenawotesuwalorafegefa.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f858a0923ec7022e8f5553506123822a/97461115632.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7048e2fc66---bizogomukezetiw.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/s9jse0cl1ee94f568q7ptmecmh/87171015042.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c02189f5e059769641d4bd036b6bb179/gitujodizuwatemuxuzaduwe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160896b62919a5---piduf.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e4f87160---30426501616.pdfIn PDF document text
    • http://hanleyresources.com/images/visisebot.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/29724648918.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nipipet.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zivijimekexasori.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/97146259343.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/luwuxanadosalin.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/65103719398.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/romugo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59a41f12e---92777794228.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9ptpdaa7sqi3sf8u0vdaakp3j8/jalakawawajogus.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/67711417650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=children%27s+picture+books+pdf+free+downloadPDF 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_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 11200 bytes
SHA-256: 14635a8d8eb9453ecd87b0ada5a59f9cd9b1b35e26f211fc30619a6778359c13
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 18504 bytes
SHA-256: fa07c86034d6de7061e3d63bd5cc38a6bb51a2e385a5580046932f83f2a8c30f