Malicious PDF — malware analysis report

Static analysis result for SHA-256 4685a72f7a2637a7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 05:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b378ca03b6c8120490504d0186ce2d2a SHA-1: 4472c825297c3f709eb8c7e8ac91fdac6f1ef5ec SHA-256: 4685a72f7a2637a795539402add014bf7204aefbb82b162657a698f1fc01f5a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=major+triads+guitar PDF link annotation
    • http://draftingfloorplan.com/ckfinder/userfiles/files/8445314520.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/tekavuwe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161338e1759644---foxevibudasejufobejen.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/708014813c658feb274721686f0f89c1/18366309990.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/miwajusaniborej.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396de66264---81184568823.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090622550973499.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5e4e99f56dc822b8ecb85a7d6f37fe6a/vufajevakomivibimeki.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109092111435102.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/pufefemimiruzavelolupajo.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/miworafalevopa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ku1vkld7idu4atel6stu4dcbp0/fovibigex.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xipegesip.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/josemuvexatudefajejitexod.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/logawazebumuvusulemibedaf.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rs6mr4oqk5gb1kjh21nhe3v75j/xosor.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12593746358.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kusudemabasuwipareve.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wafedufisawofuroxibetaven.pdfIn PDF document text
    • https://33mobility.net/uploads/files/jigivomematix.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/388126613613584d9d1e30.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/54999575958.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/regebukebizuduxunijuzul.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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 10364 bytes
SHA-256: 29942317bb63b08859639bc1915518fa19f60e98a683996c4ed25a7aae29d1cd
font_02_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 17940 bytes
SHA-256: 778bec146f20395a49e115cd6ccb59b9e2e6b3c96daa6592c0712917be416919

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