Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c6181ecc4c9f3b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-16 21:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 928859c48bfcf0a21c44ccb4e777d436 SHA-1: 5ebbbba14ac7f9dd19da1c0fe3924bfc76a2d835 SHA-256: 65c6181ecc4c9f3b20400d0b59649cb544e3df0ff9015ed6fd04dbbbf4e52859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and the extensive link farm pointing to compromised CMS uploads and disposable hosting suggest the document is designed to redirect users to malicious sites. The primary function appears to be acting as a lure to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=is+oracal+651+vinyl+waterproof PDF link annotation
    • https://vestol.bg/files/file/xorifepaduforabupolewugiw.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/87964028269.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bcae1c94a---lotogoxitexodepugufej.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/20580003025.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/govubajalosupuro.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabf8abbcfc---58350138717.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/af74968d1557d9102e85a4c176664f0d/vodimegotulez.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/miwuzetulilozuroti.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/56179840607.pdfIn PDF document text
    • http://land89.com/ckupload/files/sesigasosexatep.pdfIn PDF document text
    • https://telenovella-bg.com/files/51694620729.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/at8mbdg8rdmfsb15m50qd2rkqf/bufobovimu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jibazetomajimo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ed581b776f08e369611bfb4d53685e1/61353365751.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a63714f23aa6df4a02d3a7c0cc605078/26546780951.pdfIn PDF document text
    • http://www.moyekolodin.com/files/1155117212.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wijofowaloseluxemetos.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c633bb3c97---pimagitepe.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863268b6b98---pexerunotex.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a27c237da---jabepebisodip.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/giqatbh22dhvs69ta0tr3jpvfmjp48mf/59458635625.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ed2d456d---pufoxuvurovep.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/40975704941.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/68492921855.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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 17696 bytes
SHA-256: 5e64392911a26aaf1c004a4b66257e537debe8ab869f063789e82f10c7a4bb1c
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 11044 bytes
SHA-256: 0a1557ec9c1ab63b6ef4071230f7179f4af3b0f7d6fda75f9af8e13d849e3220
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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