Malicious PDF — malware analysis report

Static analysis result for SHA-256 f390fd726f112f08…

MALICIOUS

PDF

82.0 KB Created: 2021-08-26 13:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64225bdccecc441aeb9c222d4a21de84 SHA-1: dfe01bbd2f6d51e39d27489d814b955b42c536eb SHA-256: f390fd726f112f08b8e44619af8c0f09108a5f9f6d9a98d1067afeb759d96f65
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of external URIs and link farm heuristics strongly suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://canxetaidientu.com/images/file/86075418421.pdf In PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210808012819.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bb13321d---fosugope.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/40917225871.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/burezeguwezinabababur.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021082119375873499.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cb2b709542551f536dc9f9b7172e124c/xenijikubimonefib.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/52695067417.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/svmdrgujalobvrmuskig1e85l4/98134778647.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/nevatinitejapivamekos.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098768a01edb---resijuk.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zeguzaf.pdfIn PDF document text
    • http://blueyee.com/upload/file/221848561262.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebaf28e712---bokemakutumizetof.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/teniziginuviga.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b82daf5bed1613ae233a9aa5bf1fec89/824948846.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/bda489a3c19e570773eb657ec50eb96b/44206389606.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/84dab8478a7f5e38038cc82d325e5157/35463041733.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/31616261272.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/susomalilikilibuf.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0df586797f479de5993b53e4611b93f3/40337912811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wall+motion+echocardiographyPDF 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 17092 bytes
SHA-256: 77d0eb8b337b0e84eab026e86ba379f4445d0f489db0bf0d71cb66ac4233a6ac
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 10900 bytes
SHA-256: 8182a2540f216c774fae43550076c8a4ca7e3fe70b27d0039e2b998f0201ab8b
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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