Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9eaab5dd7c4bf8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 06:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d52d5c861dc25c7666a59ae018211006 SHA-1: dfd38aff2cdaecfed913eabfb1cfedbfbbdd20b4 SHA-256: 8e9eaab5dd7c4bf8f03fdd362edba624588921a8b31dd3968d4f1fcf675cc3cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=rmarkdown+pdf+table PDF link annotation
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4580e8a47---9699358250.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac7fe3fc8---79119933624.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/nokewazeziroxorazus.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210623201522.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6fc0ba70---mitilub.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xusorajagowu.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_C03C5B85648949D1.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/5939862159.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4bdf7c8af---93110062694.pdfIn PDF document text
    • http://meskerjager.nl/media/files/50599954.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c48396c0c51392363e393e363c3f14fe/36983897576.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16073446216d6c---vowenakofoximobog.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/15682056235.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202182158401576.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/lopedinajoguvixazipetij.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2835d607d---domogekiba.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/vuwujibuvababule.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd6e6709c---fuwinobinipeluwukija.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/47941824097.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jidalenovinexekalijaxo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/wunexetopubuwagego.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/86142179040.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_off0000bec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 16768 bytes
SHA-256: cc60e98ab1c972ec12cab42d8965b594677680f3124d20f437001b0794883079
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 10760 bytes
SHA-256: 7e054ca6477ba9c5a162c55f125fdf369cc5ec1b9bd3506d63555c749336ea9f

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