Malicious PDF — malware analysis report

Static analysis result for SHA-256 345cf055ac03d22f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 05:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f8a8ecdb55ddca8f224afab2bdc6a16 SHA-1: 2082120abcc171aa45498a74d70bb2256a740234 SHA-256: 345cf055ac03d22fda7676ce0e29d157372e4dcd3f54507b56c26ccf4d5906ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=polity+ncert+class+11+pdf PDF link annotation
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3o727cb3enqvdcne790g8ecm3v/denimoletizubu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/epnpptus60pief96c7jg4ult37/2176897601.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609982f6b8589---tawobixabuguk.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/065497f53506d246dc9e8a9656a06059/6030904625.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e005b535d---76276116816.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nizake.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/92041457156.pdfIn PDF document text
    • https://mytopics.it/uploads/file/81226241539.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/panodup.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/xekuvukuzuvebozupevu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/tilizozotusiwegigonejeru.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zewalabune.pdfIn PDF document text
    • https://ikima.fr/uploads/file/29452540092.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kafanawidilofapufenel.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/17179001198.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/tapogunomu.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/61096694884.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/makum.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wijijipoxozukuv.pdfIn PDF document text
    • https://red-adlay.com/upload/files/90814014331.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a72b23f2---77692702010.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wafadilobozar.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae56459ea---duzizi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/60tbhspsq9tpfrq7s0b9f6vl74/81948741103.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/67722733551.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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 10780 bytes
SHA-256: 8d73829efc829bd872511f3a126721be12e0ffede9a9f3e6300b4a193843a67f
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16940 bytes
SHA-256: e5dbf624d2c53204b70191e37669d3a3e6e5a844c828249a62e11c07c29a0c9e

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