Malicious PDF — malware analysis report

Static analysis result for SHA-256 8890e26d75ebfd44…

MALICIOUS

PDF

90.9 KB Created: 2021-08-10 04:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 516f227ed731e599e030fbe8200ce041 SHA-1: 56d00d52c2a768483494671c123ea98957cd804b SHA-256: 8890e26d75ebfd44d97936b925779dd5684febce05277173af87951132e02e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories. The primary goal appears to be redirecting users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and numerous external links suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=the+economics+of+money+banking+and+financial+markets+global+edition+12%2Fe PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857259fa65---zizetiz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a9be5233---womeve.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/fevuxerokiwimosewuvoxire.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/46411963857.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/509fe4952a200503fa8f7724fde5c5f3/tozurobofumewo.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/tosisuwonusisozave.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8e3758e3417b0ca5fe9ddde7bf4171ec/xijimofifolevi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac88d9611a4---fizesabo.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/35164292648.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f5418r9nvkm7mfk3n5p8ruagmm/vomarasexivo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00af42b940---vikawenikipeletixutanovu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab51906b4---rajonakave.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/67dbj9gui0b402iuam3bueddu5/tapax.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c61277ff0d---galoxosisov.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/35652854574.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88a4ba0c4---vuguwuxitafori.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73614285170.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/lejatamazejenonigafa.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210705_CA599B140751067E.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1dpae9u1aqnbfu30ic1plplv45/47192899533.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/dawet.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/19661981785.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/74097178858.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_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 11440 bytes
SHA-256: 66e5126b8eafd210fe69ea8fa6c8bea9ea34284647ad4f3407e8e12f99b70ac6
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 18004 bytes
SHA-256: 4a6fac9e766389cec7822a82e7d1402d5c164fd07c1aa0fbd3b49ae2c046a4c4
font_02_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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