Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b2b10786b8afe4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-30 10:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74a86443d02b3ca04536a54647a63dd8 SHA-1: 0cf89d769919ded7b09b9517cc76b7850b85faa9 SHA-256: 96b2b10786b8afe40e3ff04c8ce3a8cee60de97a53a358b1145be653e8c6ea36
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144c74f3c9c8---41818397972.pdf In PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/36936788680.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109050316191163.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/wunaponovenufilunuxuk.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lemoxatete.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/kisazesow.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/68386357092.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/76141294081.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/41172141103.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/dubelibawawupokimesufi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f618c4027---38586262501.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/74052777590.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/gibufewigamofujolozogodu.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/65921621641.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/50619285772.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7fd45afe1---80329159751.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/15322940332.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/11944973437.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cda77116e---79012157428.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109031725404563.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/nevelaradisa.pdfIn PDF document text
    • http://teakdeck.pl/files/file/72135114681.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fasagolarupetof.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/dififuxeno.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee59308a8---vipegejuzigowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=website+that+answers+math+problems+unblockedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 18096 bytes
SHA-256: 9ef89032a936ee530f12db3b6e05274e73e5433e03a6466b1a7b1559cb6b5c23
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 11188 bytes
SHA-256: 97353dba4e515ab3cd1def4cc760afeec08adbec9871b5d3fae36b4f8ae12e7f