Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b45535461239131…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 05:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07fa9ab1b2295c6e1bb5bc38cefdf89e SHA-1: 0fe160361ba398df9c4f37e253f49bf2cc5fe149 SHA-256: 2b45535461239131bc365fff35a080f7c2051258a30ddd1e17e3cc73ecd77ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crewmak.ru/uplcv?utm_term=aisin+afw+plus+pdf PDF link annotation
    • https://posaonakosovu.com/ckfinder/userfiles/files/xalevitewajelubu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/892142968581625516674.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609060ca0f3dc---94836073027.pdfIn PDF document text
    • https://jss-moms.si/upload/File/peganorunapanilejajazafek.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/38ea28a8baf7cfd18cfa582366084f48/rugufufotip.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/29814333511.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/28667821446.pdfIn PDF document text
    • https://wasael.com/userfiles/file/voxadubozodu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092157028fce---duxufinoludajex.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160941f3a416e4---dudewilenirewixezidupuga.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/06164841909.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210905031348_1612533944.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f29b04d827d---17503594660.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/gaxoserobevo.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/94215116971.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba596300ca3---72854747483.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/turabatabijizajutuwemixed.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db78ce22e---73206066950.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/mawagutigego.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/31653425903.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/45997419210.pdfIn PDF document text
    • http://terminsk.by/pics/files/66547956263.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA16 17948 bytes
SHA-256: 67d4f1e19fe83b0752b81c27983d50646baefd5ffe7ab5dc209b5079906975ce
font_01_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 18712 bytes
SHA-256: bcbf7543ddf410f0234652bd24f26e406c992eb045d399bdd001e3d02339b6f8
font_02_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 10208 bytes
SHA-256: df977253c2951e999f5dcc045e2a8bd14a96ee2f647db178cda81aa37004a65c

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