Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f1fe236b410fe5…

MALICIOUS

PDF

98.0 KB Created: 2021-09-06 10:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed2c65f397ae996b241539b5bc27642a SHA-1: 09ae0563178a1c94593fb9e3af94c76b9db1a547 SHA-256: 94f1fe236b410fe577049a21f625fabbbb1443ff88af85c1652ad70ab056c0c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://parklanehotel.asia/userfiles/file/pumewenomadawomane.pdf In PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/47791468491.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/xafalibidejora.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/65787562531.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/22720828489.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/51468961655.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/26511559084.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/zivadusugebake.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/lezojuzulixuwodiso.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j2l9udlgc65d659op6p16ql971/bugipojibonarigujoz.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/44455576989.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/rezimu.pdfIn PDF document text
    • http://maryamghiasi.com/images/upload/files/jesizowu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f93ce55a---34165418553.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/gebivatuzuk.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d35f06200a966ae0a8d534d189db83ba/29131867320.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/26237012682.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095581430008---wowasuno.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/vekobomuwodobolozeg.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/3235923932.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb388214be---xoropijavetanatologasama.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/249te8ndnqs8urd6pv2up6rndm/tadekopowutiruwipapin.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90673661434.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/fipokinodusobi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56a29a475---wiradipapolujorulunedoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=canon+ip100+series+manualPDF 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_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 10620 bytes
SHA-256: c117fe51f778685c698cdeaadc7d2c1b7ba3958ef0dc7eafa5dbd2b8cc1e1ff6
font_01_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 18208 bytes
SHA-256: dcc443d84fbdf9781eb48344071e9abff9aae778e119016dc14057b47e8fc796
font_02_sfnt_off0001621e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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