Malicious PDF — malware analysis report

Static analysis result for SHA-256 972ed8a272477e60…

MALICIOUS

PDF

99.8 KB Created: 2021-09-10 08:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bc4b2a9f7bf1b9498fdab218be71fc2 SHA-1: 81ad9754b5084abf7f9a275b305e4c7ae62575c4 SHA-256: 972ed8a272477e60f6b54effe78e95e1efaf75271348198af45245c3eba10284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://associazionemusicaviva.it/uploads/file/68220145718.pdf In PDF document text
    • http://1000projects.ru/upload_picture/file/88645716214.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f431cfd68ce8498a5fa48c84673c682a/54686784974.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8526dafb---sebitunaliwepase.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/7248829304.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/6821235547.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/13224025285.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/81299772466.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/samemiganibi.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/rifipotukutuwoseza.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26156595553.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/puvanuzewepi.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/69047863163.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/kinaxiwukofu.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/lopomovexezaxe.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/dunuxijagezat.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/42322935406.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/q2p7r8buncablh7rd392e8t20h/56399207477.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/muvuxutetixizijusuzuma.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/56381139041.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/48506946164.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f04a72ada---34130171941.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zozalazuwawizaratazobofi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161365748ac9a5---72278508056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fast+and+furious+9+full+hd+moviePDF 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_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 10928 bytes
SHA-256: a3af6ad20eadb2995ab109392d525f5fc786c07964058c1c3b32b0f2e6bd0c8f
font_02_sfnt_off00015360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15360 17720 bytes
SHA-256: 8664dbc6fca7aa24191a826d026906f7a53e06216217ac5eaf34f214936ae4c8