Malicious PDF — malware analysis report

Static analysis result for SHA-256 b001e948e0c64cd8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 19:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 535ed4149be0eb3adbd806fe56ad7cd3 SHA-1: a7049571821acca420c64fea6f59635bb68fc767 SHA-256: b001e948e0c64cd81fba16daef41dc3ce70bde7a9c6055949c084926cbbea673
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised CMS uploads or disposable hosting, suggesting a link farm for malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://isigakizima.net/img/tmp/file/tetinireduxiduwuvos.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631129172_1.pdfIn PDF document text
    • https://lapakunited.com/contents/files/1252196262.pdfIn PDF document text
    • https://moolans.com/uploads/files/985279650.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/tasefasajonav.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/bafuzisisilemowemafatupu.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/dofetuzuwim.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/82692468996.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/vomixipimalamiguxolesonar.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ebd1821d07a5daae4c382e73ed94d30d/36431196206.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5c8db064---mogidom.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/71643459366.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/rimevagemese.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/96315702260.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a4d0d1c43---82772182499.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/45f4fe976b38ea19f2b1c1c83ba75dbc/88199610689.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109081537202551.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/68363588744.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/1385673097.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/98586409432.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/37999488157.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3840b5580f589e49c706e26e007f969a/88201424873.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/tikifukimumofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grand+theft+auto+v+file+for+ppssppPDF 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 17772 bytes
SHA-256: 6ca3fb0a2ed6a53465f9751317f9627126d0c5fcd3f085ad71e8bde2f986ea24
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10800 bytes
SHA-256: ce7e682d842ad06e1e4cd355cbe03998d3837475a2521e82628b043c66350967
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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