Malicious PDF — malware analysis report

Static analysis result for SHA-256 997a80373496edfd…

MALICIOUS

PDF

98.1 KB Created: 2021-08-15 11:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0866f470b878135a1010928604387e8e SHA-1: 6cd68e0e5811e4765742a50d7c79c872fe144000 SHA-256: 997a80373496edfd3f78a436132f8d714f7594fe2d49c3d4d7beda86a4c735c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary attack pattern appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 https://crewmak.ru/uplcv?utm_term=what+is+a+moorish+american+citizen PDF link annotation
    • http://projecthouse.bg/uploads/CKfinder/files/wibixoxuw.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ggelan495bbuaas6hoopr39ob1/lowowomovasusolerekafa.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/936eadf710eb22e791c9a7b615768b17/xovududekamenogopod.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/1833242295.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d8li4vpvml539dq8rpq1ga22j7/kotuzenamejipidavokinek.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/37964847706.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107060945.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rva06k2ksb1ss72sjj8m82ram4/81504629965.pdfIn PDF document text
    • http://firegallery.ru/img/upload/16302165038.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/livaludemonaxuwofesuf.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/d1bdjho0oeu3oq750dt659mu3e/leponuxejuwezukuzo.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/galawepariterokaxa.pdfIn PDF document text
    • http://cpils.com/userfiles/file/zifawosag.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c544abf97---fuzotivipusalutoz.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/98710782465.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d18e155de9---nanamuba.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/55820246638.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/75714915409.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ger104jrtimdr0agjqbk7ropod/4555960564.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/lorefurugo.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/18cd2c607fad50c1d02ba4779d470a80/72997868773.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r97oq173pnhf9sm86khs92cl36/43062783523.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/86616440943.pdfIn PDF document text
    • 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_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16780 bytes
SHA-256: ec5d996b3c073a43238b0f994b0b1a91b8929f8ffbc007f2e32853d4077aadbb
font_01_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 17836 bytes
SHA-256: 1ce86e2a00928b7a3ceef61ddef2eef741b64f55ef3499ed16e3569d854d8984
font_02_sfnt_off000148f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001610a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610A 10500 bytes
SHA-256: f07a2a2751acd2a6824f1bb6d3fb7133dc178a916a70b8d5bebc999cfea4afda