Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b745a8811099769…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 04:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de1d038ae5313dc6803d5e72c61116de SHA-1: 0d19f3ce42ce9c29b618326b36a21b71079e5547 SHA-256: 4b745a8811099769a10de5be4ad565f005439d5d865cc715b7fc0c0e4b383cff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into believing they need a password to access an archive or attachment, a common tactic for delivering malware. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, further support the malicious nature of the document, likely serving as a distribution point for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab07cdd368---86689861331.pdf In PDF document text
    • https://sweetburden.com/upload/users/files/64145075622.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/67155924190.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/20180787948.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/61062251288.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c3ff08ba1---85222676074.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd19d8d664813c82a4ef48889fa58c01/lejogokexugibesifefuwekax.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kinuzabifafixerodi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137afe7deb99---46090396531.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdff6baa9c---guzadezorifilajekowaruza.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d6fbe345---gijof.pdfIn PDF document text
    • http://dezis.ru/uploads/files/26350777156.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/41777724838.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/jibafijutaritobag.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/duvojajobojizos.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/73269650646.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/57647520729.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/26618262955.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/rasilitinivep.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/10049267546.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/59857823483.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac83fbb436---8598012446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=como+quitar+patron+de+desbloqueo+android+sin+resetearPDF 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 18908 bytes
SHA-256: 0f0bc5c050ef768c2db4cfb3acf6b1a25e66b7fe50849d991c8a91281f688109
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10972 bytes
SHA-256: 12aacb557abc0d8464dd67e5b34d9cad23a760939a8c11098e8dd6da4a9e7efe
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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