Malicious PDF — malware analysis report

Static analysis result for SHA-256 874394bcb6678870…

MALICIOUS

PDF

91.3 KB Created: 2021-07-27 05:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ac0953596367545e55c57844bdbd67f SHA-1: 429c74c511cb4b23760dd07f0f36312f17d63ad9 SHA-256: 874394bcb6678870bb09fdd771d856bec88b5779a6c864d649a38aff53ed26a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of numerous links and the use of 'utm_term' parameters further support the attack pattern of luring users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://a2designbg.com/userfiles/file/48022581951.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/guvofemalo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/5sj4jnqs15evthfhm5t2i0a6v7/70746209974.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a038a3ee8cd699d8f28835eb0bb8bf70/kewiweribajex.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xebatesereler.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e8qc0rj1udaq1itljdkkak5mon/12451596688.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nd2psqt4ahoee7atnmd193s464/goperuzeguvufakoku.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/38660212534.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/40951557925.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/de7c8e6bb0921896cd1efbb119a28d94/9830378718.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/epv5g46nmavcmck2c02kqb4pmi/51936218227.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ssuinh2e22ldvfmju9lmifgm4/lelevajepoxisizibewurulus.pdfIn PDF document text
    • https://goodline.by/userfiles/file/radegebazaminasakegugavef.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/temodavazatuw.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/16238253381.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6a5edf85c1303be7f6b591f9ee835dfc/41946077551.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096c065052cd---52669016515.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/sulifunilukifina.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dugijiguzanasirodexid.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/kivarafebatonibo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee613415b34.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/60889002712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=como+colocar+una+matriz+en+wordPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 10640 bytes
SHA-256: 57a55501ff7104df9019a2c0fd930a9d2f31ffd6a257191fe5d7aa0058e34071
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 19676 bytes
SHA-256: 6f94f77e879c53b063be231b56aff8cd71f9958e8a42688d5db92e3e405d160f

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