Malicious PDF — malware analysis report

Static analysis result for SHA-256 e963e323f64ca76e…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 08:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cfcc2f8fe30fc2a041bbfcf5bbb4692 SHA-1: 225bf54471a4de424909c81336954bd5a46b9b9c SHA-256: e963e323f64ca76e789f64883c34b27365027f5863578edfecc4743590db774a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://creativetalentnetwork.com/ckfinder/userfiles/files/mowojulatomuragi.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5b069b9d---fikebutelimixuterofitaji.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/97484839206.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/7442646487.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0175feb8c9fde6174184ececab63bd05/25560306848.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3fd7cfbdf---91966275484.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/desatumimawojadujirad.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lifaniwimilegunebiwumet.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210925_E83C4A6FA0E99160.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/77482177701.pdfIn PDF document text
    • https://premium-house.uz/images/file/jesafuwak.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/1242582226.pdfIn PDF document text
    • https://italvaping.com/file/penuxiwuxojebopisatowen.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/sexufipi.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/63265369642.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dc2e94457fb486cf92b6e605d0d1ae03/94088924103.pdfIn PDF document text
    • http://lblussana.it/images/file/duwetugodoke.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/68521785816.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/46233594485.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/85259155122.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/7349735582.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/tipomovinobaratabiwowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=top+sport+streaming+sites+2020PDF 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_off0000ad6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6D 16988 bytes
SHA-256: cd8458b79f141c847d183e9f829f8660e9df7b8a319cfa48377e2c7d9d797021
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 10756 bytes
SHA-256: 2bb359bc292c3d9869c18f076200d4a5f22dc254fb0527621f879fd5b127209d
font_02_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1