Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f7f30945508277…

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 14:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d86b2730cf3fb13fb3a537a9947ac51a SHA-1: 75f6d9d7ea64ae8883b0b53129dc255bb08a3008 SHA-256: c8f7f3094550827767df3b2b66c3c506ec0cc803f8c82984830f73199731903a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript may be used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nigerseedindia.com/uploads/18269922496.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613761d73efde---mewew.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc6e99d062e4a9b93250694232e8d5d6/17182865929.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wegumusuwizikuwawagiwego.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/35496026286.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/31608003027.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/43936547921.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/28412719624.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2cedcfaf---16098627827.pdfIn PDF document text
    • https://dptech.vn/uploads/files/26573975959.pdfIn PDF document text
    • http://zzquansu.cn/d/files/65391930491.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/54482709845.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/15588311057.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/toxosuzufenavovaguvewos.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/mimodivunilidiro.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/60701701327.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mco1up2pqt89678h3ut0u3ia9n/904030897.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/95577435932.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/favivop.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/90856567628.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/65083748144.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/67094293485.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/38587250589.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jemepimapigukiloxogin.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/e04784ddd4fe283f6adfe412f218fdfa/vasevefudenupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=3d+pdf+viewer+macPDF 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_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 18440 bytes
SHA-256: 5024460f51ba964396305332df99247039fb1eee369aca8b068a180735c4873e
font_01_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 10472 bytes
SHA-256: 19b831f5b3c6f878d875d424ff7ec75607c3fa50dd6833e1df9222cde0fe7f25
font_02_sfnt_off000143ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1