Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6547635f9776b6e…

MALICIOUS

PDF

94.7 KB Created: 2021-07-01 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a214aeddc3fdfec95da0fb01455020a SHA-1: ad5874ebc42579b595c17b1189d60291dbba919e SHA-256: c6547635f9776b6e9eaaf51accc173e878e3c6d095162bea0f401ba0e3000f89
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier also flagged it as malicious. The presence of these links suggests an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://kaitosushisb.com/uploads/files/duluvusabomixibafuda.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/toejohvtil0v8r253ovg15gb0c/63784925786.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/toxuruberonezojibinan.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/kelejemazabafifusaxa.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d96ac193f6---37472278817.pdf
    • http://myconnect-thailand.com/image/upload/File/21415768904.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7ccfa1106ab16f4d770b04819064fa5e/fesalofasezijuxul.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1c632aadb86419a3d9d32ade16f14dae/sugewotisidikewiropenele.pdf
    • http://mevlanaasm.com/resimler/files/64188004212.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e4f255da---sonibexofuz.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607789dc39096---99907167558.pdf
    • http://truthtube.com/UserFiles/file/72714073164.pdf
    • https://maisonforville.be/documents/file/sugodi.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa29e89425---82232169052.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c4ad3df7---zulas.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082194604df1---memosevona.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/84846d5366ef253106f436c9bc7b5546/2660889752.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/9nl4fqcpdltd6ib70ttd00o7sd/wujaruvamef.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/aopmhpvfo3h0tcvt7hjik1ie16/mujizekobulaw.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/45116232581.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/07ed7866e310fd7149b290634663456d/buzokogudijudamitegokero.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0bb014c0f235355047508f2e5f57bf35/52385474656.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f532a365---xavewolomepuxidaret.pdf
    • http://banghetretunhien.com/media/ftp/file/gorunuvetumaba.pdf
    • http://www.darvidproperty.com/news/file/82868418422.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=you+say+you+wanna+try
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16792 bytes
font_01_sfnt_off00012c3f.bin
fcd3b5a0672e7875bfe071ed96cd8213f171c8288a247521c28fb9df41522799
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10116 bytes
font_02_sfnt_off00014304.bin
0fb4ec89080dae3fbe4d3603b45b35e56b92c0b55b43103ad6def4f841ecd86f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 16560 bytes