Malicious PDF — malware analysis report

Static analysis result for SHA-256 165f77baafcb9f34…

MALICIOUS

PDF

89.0 KB Created: 2021-07-27 16:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bda96d5e40a2c326c908c3a442a7fe98 SHA-1: 947ffbd6e124623294440d6f69494e2e97750d65 SHA-256: 165f77baafcb9f34e834a1169085cea86858ce57bb815b41a23eae36b33934a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://wardwrightself.com/clients/863644/File/vutobububesotir.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/sedoke.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae041a5d38f---gaxebizuta.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/34375308721.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/lsmvb16m79h1t8hs9u6m2j9u6u/45092254215.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1b05jg22utit0sr83lng2t79nr/gujoxuvoseti.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/rodevogudesedusado.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/xufal.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5a563fdb---44910992400.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/suximodanonoxogawamawa.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vibuxedabudinejidenuvuto.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/98001423442.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/baa15f24e5a2d281666debe448672b3b/fumelikomin.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/76656871526.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/tafonezugetapebilopirotu.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/gobudamoboba.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/mosunixerojevezugedalo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a726d21f2---79511005291.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/1996187586.pdfIn PDF document text
    • http://ubest.ru/images/file/65928992421.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/03e93007bb883fece580faad71ec92e2/31098430900.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7c7759b0a21aec43f7abd3740533daf3/50621805468.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d702e7b8f---nixuxole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=snow+bros+2+mod+apk+downloadPDF 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_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10744 bytes
SHA-256: c4bc772a6b21b7e6e1d214d791d37c4e48b3e35f92b2dd353f332666c158a4af
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 17780 bytes
SHA-256: 1297cf104edf024dfe61c31bf612972b4e9275d41043df8a5a3acfe8e389c634
font_02_sfnt_off00013dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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