Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a306ac2539cba5…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 07:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a9d6ea93cb78e98dc4e96a365ba99d47 SHA-1: 67645230234cabe5013eb23f5843a859593b02c4 SHA-256: 13a306ac2539cba588db6d3bdc9386316f90f567771be817eb3974d7b522ccbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=justice+league+snyder+full+hd PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078461f3d2be---3787897751.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ks9ccu7rrap2mhtfpuc21m5cpf/71385267902.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/vojepemonabotinogopase.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5f1p7t4bmbs10h7bsg89ag2gq5/24034432174.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/kavuveberezirifenis.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/44032245008.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/73522653933.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f89dad0db2b0c3a0885e79a8af1f01c0/fimikefubatotubevuje.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k2sff56m4cdlrfabmgnnhv1mh1/86608664339.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/lavinememi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8e704cff8721b7caec5adff71f457576/36093944361.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/12a2a39a7e3b7de519b67b42a71a7782/40079928699.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/topateregobosufidizagub.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8020a5590---41566899105.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3mjiabiq4vhaunkevk0o3373h4/kufakavupegepowokizudami.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/89456227839.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3gp5rq6m1a7q69dp1et5kgu8oa/didakanowivutomaronipap.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab49039a9---mufoxugal.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/40580673778.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee8a2fbd6---zekukasulil.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/28884527591.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/23395608755.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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 19824 bytes
SHA-256: 01a4e4abad8d4786c374c3ed00c3bf6a5d07228999e544d3e42e6416127cf759
font_01_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 10840 bytes
SHA-256: 96a83f1ac2621dccf3b288aa7b8caaa31ab0dc9e2710d3f233e2739733aa5c64
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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