Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadbef622a0c409e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 14:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7177d24fe8e0dd78cb3b98cb8059b043 SHA-1: 32ff44f5f0939f040cb509e9ea104888bdf46b47 SHA-256: fadbef622a0c409e0ca1d17f679c1bead33764bf52eaa2254b48994e158fc6a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The file contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://samarpanbharat.org/trila/userfiles/file/92488742600.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f7b2e312---patusoferutorefizu.pdfIn PDF document text
    • http://balone.net/_upload/file///65378671470.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/bivugolezirepubutilewe.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/pexamelokijowusoz.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/42294291654.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/rurikenerezogasegewetanu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf6ea343b---61412578456.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8bc3473b---torov.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5d3f1eb4---gosurufivibox.pdfIn PDF document text
    • http://alvitraders.com/files/pilaxobixox.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/vuxavexokixezazupaxage.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/sirosakiwus.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/832225146761a4f0592bc284048eb19a/52347579952.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8761ba710---binisibidamofapigi.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/kuwurovapukajol.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/mapanijanumuvuxanija.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/412d649e28c6ffb163cc5ddab3b00bd1/86857678015.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/mafivedokuzuwav.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff6c27f3---tupemarodemumonomir.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd672965d6e41db78419ef5f4e0aa25d/luzuxubexuje.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/naxekaseluxigowa.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/96767264541.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/vifitapagid.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c25f6fcde673bea95b1db628eebb7920/voxiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=stamp+duty+exemptPDF 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_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10316 bytes
SHA-256: ffdb1137d7809be660623ef801b62e50f2e2c01e68fc27f781ed419551e16a40
font_02_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 17860 bytes
SHA-256: cd195576b2c6d0036579593a8454d3b21837553d27fd8871aa7b8dde429aba10

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