Malicious PDF — malware analysis report

Static analysis result for SHA-256 d841e901e361e968…

MALICIOUS

PDF

109.4 KB Created: 2021-09-07 06:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00cdf288425808f2ca82eda538cef6ec SHA-1: 97d9ed9e590e6502bedc7c85028aba0d9891efb5 SHA-256: d841e901e361e968d838868e0c6535703aa5281689a5288e9272541f3534f5e6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/23316927493.pdf In PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/30b1b92fe150665cfd93e05e2221c45e/48450474754.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/75740174552.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a403a394a22---magarerog.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef59454dea---jujewobor.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/34410785173.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/34274551647.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/delupaf.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/83087873143.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/de5a6483905d9863e046890fc919e727/molusixekusevor.pdfIn PDF document text
    • http://abnicum.com/files/file/29303796870.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/gemebuwijo.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xowuwenevimosaxupuzoze.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/94513069432.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a010a6596---77293633600.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4loljpc9bp8n4pl2rreqn0e1s4/sixonisi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/welavigofafemivitutew.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103d1605a5---finazusexepadapexate.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e4ae439bdd2115e33ff4954f5b1af960/gasugew.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sutemabexepumadere.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1d785414ba1683ceec574931a7025c73/27943078204.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4ad549f605a8d30bafbc7d1bd7233743/2543642215.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117e7ae2ba76---48447657805.pdfIn PDF document text
    • http://yanartextil.com/firma/files/nerisemabuxunojizufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=slavery+and+serfdom+in+the+middle+ages+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001408e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408E 20732 bytes
SHA-256: e5a88252597186965d9009191ffbf9db5f290170577d13f64f262fb512863dbb
font_01_sfnt_off00017711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17711 11200 bytes
SHA-256: 889dca143d0d657a70a87db537d8b712dfa5339ef38a29519a54968fbd672d45
font_02_sfnt_off000190e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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