Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f725004d1722e6e…

MALICIOUS

PDF

87.5 KB Created: 2021-07-09 02:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e7a59b22994186451fa16f1ee7d5a30b SHA-1: 2a4f088cb18a5f90b0c06c7de4a36422c2514537 SHA-256: 9f725004d1722e6e8d8d2cb7c5fe2170ccc926e00f496425bbf35f85914259d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The sample contains a large number of embedded URLs, many of which point to compromised WordPress installations, suggesting a phishing or link-farming campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded links.

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://inwebjor.ru/uplcv?utm_term=less+platelet+count+causes PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e40073466---31107519296.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/ditiza.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c776aaa165e---30933055324.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/xuropazitunilunibadus.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391cc87454---xekewuzejer.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/82419397995.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43a05afc2---wadijilimafenedo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pa77r5hhabdnguh2t7p7rnd8h3/63949078153.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/57387745948.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/7056882758.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/45942758280.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5e529b58---runazama.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd434ad5c9---15269675903.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/98636706730.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/18b02vfovi45ninhdjdtkom621/savademawexikugabajizamup.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7b41c58c699caf13615b919aa5cae579/situkefijalo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/gefufivurelazudomopuk.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/40974194906.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/df58cfc4b9111cea3eece6ddf345fde5/dodakizov.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/27d5e5451bbbbb35526fdfd31f45f61f/34805612231.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210705114858.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5061b89db1---risitaxijodirezakavuponeb.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567b771e5b---wobak.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/900c154618b0a79142931f7607b1dd4f/wopamomufekafe.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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 17120 bytes
SHA-256: 882d7a0697cdcfce22485099425c2d99663a025fe50a380528297dd220cff610
font_02_sfnt_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 10232 bytes
SHA-256: dc701bb92d6444be130fd19e0ed2daaac15786f557f81419ff77a8b9eca2e7da

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