Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a86988b93de69d…

MALICIOUS

PDF

95.4 KB Created: 2021-08-11 03:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9687a1781997d0ccc10f1411d9f4814e SHA-1: 0f859ccd05bc60eb50bb324c40560a76782d21e9 SHA-256: e3a86988b93de69d64e744ab5ca316af44334ed06a826f90727f8ed9634a4789
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The document also includes instructions to disable security software, a high-risk indicator for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://altiro.nl/home/tjerk/file/xanojaw.pdf In PDF document text
    • http://yonseri.org/userfiles/files/resukekokezumefirisalozej.pdfIn PDF document text
    • http://saptpadi.com/files/file/nupugufolajefutenu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846b17024a---dokivogivesezezinemu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607154544975d---92130617439.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8717amhfd9mncqk2dtsrctcja3/35890691359.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae4b7abfeb---53999716909.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/kefijulasatamubexew.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623772796.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fe1396a576129713c2bed3e8573438c6/67276705657.pdfIn PDF document text
    • https://landbar.com/upload/files/lekiranenuvorajiga.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4224d82ce---webivalonewuxov.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/potelasamawoduxosozusek.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/21815890290.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/36202717349.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zoduti.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608319cecc03a---ralidevisixuvesovo.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080facb23ed1---mapudomo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/10033506146.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9cad732907376aa699bac39225e76af5/5237020870.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/99194236021.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/42775086759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=9v+alkaline+battery+lifePDF 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_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 10400 bytes
SHA-256: fbb81ae7795c8cd97936eb4391306be7765540ee3e4ff5bb9da9811e9f3b5caa
font_02_sfnt_off00013e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E54 18104 bytes
SHA-256: 835a668c31fab652635235bd33172708211fdb6a993d8be4555fcb25e5156850

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