Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3232cd09c66a14…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 20:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 065661cba710af4fddbe66b150781553 SHA-1: 8ea93f88aad69be738e31bddd2565da0e2ac40ba SHA-256: 3d3232cd09c66a14b17d96eb545e8162d0acd30868d28357772fcdcec6b21564
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094593d5add6---waredajezumatal.pdf In PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/29931540424.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210621_B1788A149B5A1D42.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2886452313---dasurinatavemu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rufoxofuloretukis.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ce74a3e4c1c1435a15e8833d3856461d/lavetidoxonisidaguboduzi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/xarojivamaviwo.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210723193203_7m4286.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba53d697f0---14378447580.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/gejaxekirexatowisel.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cc9a98f6c---makoxokijivajoz.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/92987302822.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072017214685.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2776ec76aabd84ee4726627c2d4448fa/muzebisumeluj.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/30104794665.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/ramusetirimevir.pdfIn PDF document text
    • https://riwg.in/userfiles/file/radimi.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/60155511820.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u8ub2rru8fd9t3ds69fo6s27f4/xenamubok.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f1014fa2c5f0f012bc9ecfa26d0f70a5/tobotazivemigiziwajuz.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/92702500137.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/39801482206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rumple+leed+adalah+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 17328 bytes
SHA-256: 6964eafacd194c28b93e66324fa1e6eda34decb996879ad4d5c621339b562ee4
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10228 bytes
SHA-256: 104b98fd5e91dd257019eab1be000cddfc3daac94a8d20b6da174126e97f1495
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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