Malicious PDF — malware analysis report

Static analysis result for SHA-256 879a544427411388…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 15:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe059e24ce20fc0e9640e93d3dad0823 SHA-1: 3fcfad228c6d0bc606c0952a3d8805cac5a12a18 SHA-256: 879a544427411388e1b9cfbd9e7ac9d70597d13d5073e6a0e7fb6f076b88e22d
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 CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=tekken+3+download+android+apk PDF link annotation
    • http://nurugelexport.com/ckfinder/userfiles/files/lizigimokofugutadixi.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vabep.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/wifivopifilakowopuromasab.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/somif.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/35357584746.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/56945861616.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/25175305239.pdfIn PDF document text
    • http://vaynhe.com/upload/files/sukil.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/23538691215.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/poicf2phil9g8q7ir3i1r9gb08/59597292825.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be3602b73---90685251035.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/29193040128.pdfIn PDF document text
    • http://elitacasa.it/images/file/83698635247.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/gopoxun.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/70734796751.pdfIn PDF document text
    • http://millecolori.it/images/file/wemaz.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/64380642107.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161323bfb77a8c---zelipexosufox.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/70851856731.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/55832990697.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/zelifazuwululunepoxo.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/93475578084.pdfIn PDF document text
    • https://linardi.ru/files/file/34736733981.pdfIn PDF document text
    • https://asiapharma.la/files/files/xifujiruwawabodiga.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613612bf78126---vizasadovorufo.pdfIn PDF document text
    • 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_off0000b798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB798 16620 bytes
SHA-256: c0080ce0b2ab5ed1ff10e6493793d21734ab2cc2ed47bc13a8b9d4d843552ac3
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 10432 bytes
SHA-256: c790dcccbb4fe1f17186339b3acc104891030c163db26ccefd8947b321816516
font_02_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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