Malicious PDF — malware analysis report

Static analysis result for SHA-256 6545c94c6c115e25…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 11:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caf0f9daf49dc6f15194ac2b68c93872 SHA-1: 72edca6dfd4802ed07527f036041e3cff3838a50 SHA-256: 6545c94c6c115e25d173e839dee1fc5dcb96884ff2509c230a701397eafa372e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs to host a large number of outbound links, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=pavane+flute+pdf PDF link annotation
    • http://www.findvoters.com/userfiles/file/14720052292.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/xibinojutawifokafemub.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/857663460470f5d4a33707af00a1a0b7/bapikapuxejejefug.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa247e0e0f---woviguxubalubusesa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/49583837876.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fobufojeloporir.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/zafepilamizimave.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/243d66bcb635ae03bd61c7083e13fbdc/mexidadoje.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vetaziletane.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/7j9v4cb67kso5aued0e61a1n70/pigadedasiwepiwabuxad.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/75307714797.pdfIn PDF document text
    • http://fedime.org/imagenes/13116673404.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/69616030879.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/622616848.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/senulawatupon.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ec90710c7---wutokuxokivizevopaba.pdfIn PDF document text
    • https://nexusmediation.nl/files/jikupeziwufi.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/kivuvadejifukan.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/pufamozawexomepadinepobe.pdfIn PDF document text
    • https://isleo.com/i_photos/file/detafasavuwari.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/fofob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 19572 bytes
SHA-256: 348e5d04721ba46da69a0d05f3a429ff15d83f6d36b76c48183485e0e14c0c71
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 10176 bytes
SHA-256: 010157fcfec996b132458f23ae6199aa8caa49520ecf1ee7fa7f3f006858c97e

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