Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61501b40a5100bc…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 14:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8af64e1216d6ed2e1f1d04e11e886496 SHA-1: a46c0f9ce04d15622622f6b3bad2511f6f12ddca SHA-256: e61501b40a5100bc23f22e61c79502269c12f88939d17ed9fb246565c2f285c8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable domains, such as http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de071f60706---gotoxa.pdf. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://ntct-dz.com/ckfinder/userfiles/files/94177097960.pdf In PDF document text
    • https://leosservices.com/userfiles/file/82690224635.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/23252014449.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/moguvigakuw.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a38b86e82cfbbbea827c35755b59cb8e/40386909241.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wekafedasuzol.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/loladigid.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1674e5ca5f---88007662456.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/punipiserazudami.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f5204f8509f612a580ff9c6b415c2435/87802353380.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de071f60706---gotoxa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096508bb298e---6473301706.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/35402132205.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/51712628280.pdfIn PDF document text
    • http://napiarsaigh.com/images/7881191954.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/64476783533.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4aebe131ab9b0b02719ad12af85b77e/3611842143.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/xedigowegupitosebofa.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/96425505924.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/66544585812.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/xaxipenuzut.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae533d40bf---74178806513.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/60416020562.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/85095499654.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/lukirokajekus.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073285bde000---55606555847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=that+is+wrongPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 17772 bytes
SHA-256: 136c480a0086674bc14e1a2f0632e07f7a35bd9a3182b94181f001eda6b9a828
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 17932 bytes
SHA-256: 2deeed010861203706ab2e1ba5738a60073d78ba45dd4593b6848a921e9d4c3f
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10256 bytes
SHA-256: ff9c82b5d7fb3507abe22be59aade6197eff2a8b274631feb39942c90d7829fc
font_03_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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