Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d95d02e4853bcf3…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 15:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e140c3b83dc082dcff87fdddf5b8bcca SHA-1: e1d67afaf393db5899232e5679d51559e7348e7e SHA-256: 9d95d02e4853bcf39d4bd95ff9a764eecb5e14b9aaef950a0f0a61ec72148996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

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://queure.ru/uplcv?utm_term=managerial+economics+exam+questions+and+answers+pdf PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffc26c5ab---26846829827.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/womiwidezavewemoj.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/1399808958.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c721acbe---xeporipu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e773ee24a---74189668233.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609840eb3b0e0---gegivupukovidibivuzonopa.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/magawikeb.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/degugenovikiwuvituse.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/nugawidamatusimuxujome.pdfIn PDF document text
    • https://ksuskalology.com/images/file/46326087299.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210627042944.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/11914508699.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/338ef2aadbc434d2691855c365972410/tizibiti.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160add065e89d0---pokodawabazidojuwonewux.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4996b96cb0---44335012742.pdfIn PDF document text
    • https://rotitelor.com/contents//files/xasapojopuledoxa.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021082022145850.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d629f9e5---pigarapafovemepufisakaf.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fogojojidewebesegerako.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/24575606631.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f936d9a6---63795419638.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/rojuzegozaxuruzarumuduva.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/bonopazeg.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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 11392 bytes
SHA-256: d1cbb27226bcd021842245ec033fa687b0b4e1653e44710b63398a487230c9ad
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 17624 bytes
SHA-256: d3230f696c3c2a9d36b4e63ebd127adfb5af129b0942bb9f5ff0a7e3a7851b10

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