Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d56df22ccb6810…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 05:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a788fee91a39eb5e3b06b1211203fd94 SHA-1: 10450597cba0ef6c89f5bb673473efdc93a8752a SHA-256: c4d56df22ccb68107f4b50d209596083215f11bdbd96af5358acc5b27760557e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3de6c8ffcea50b64f1ee2016b074bcc3/betiwamafuvugibodudasigo.pdf In PDF document text
    • https://mariellatriolo.it/public/file/mavivozizupibosomipe.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b6581250d4b3e7172992be547dc6120b/gixejipobuvosulis.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/61967932593.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/50520822375.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3fc76288e---82674552328.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t7j9m0ar6v40c19em9dno7rpo9/fodutoj.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/gazodoxu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/82601c2dc835a9409988e0b0c59458ea/18621318178.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lncu09uusp88a0lv0f2nhfn0p2/xaxenobit.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-26/20210826042227283919.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/89616597402.pdfIn PDF document text
    • https://educhina.mn/editor/files/56328580066.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161106330bbfa8---vovebagetukupiw.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/3316394047.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jedug.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/31822725923.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/75632287710.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/18038806527.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b7c42c24---11311959477.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/62170458580.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/95042995564.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/13198657227.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/87015467025.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/98f40af34d1ccf7339c25b98fe111291/vibobenegovudebininexuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ai+suite+iii+downloadPDF 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_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 17964 bytes
SHA-256: 1be33b2c5291e227ee38ee8754d68da2a1f55455a573de8e0635643ce71ac66a
font_01_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 10308 bytes
SHA-256: ed4de572c31a193694d2089fc495c46301340409d2f150e08c6a82047d5f7866
font_02_sfnt_off00013a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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