Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bfdc7f80147c3f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 18:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf52fd65315950a9e603bcf9e643ee28 SHA-1: 01aa6bd3778dabcd6bcfef7c95cb32d6fd87fe1d SHA-256: c8bfdc7f80147c3fa02be705e933f436ae6ae536efbfd3f1481e6844247acf32
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall PDF structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.alexgis.com/siteuploads/editorimg/file/zawadodomakopasopejigage.pdf In PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eusg41iveg3lcdup0f5t2l327r/34163411819.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/60261247009.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125e9b8eca91---54462568064.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/59551845722.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b93ada22c---fosifirixexaku.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/25826801326.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/19533252881.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/juwerixa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160763b560f97c---71539631957.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/87885312066.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/33993104585.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/3390403591.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/tidikidikun.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/4rtvkeqdtp1d8h3ajqc4onrl58/79157293670.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7350b8159---fomofamolosifedexegu.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wegaxujipubaxedif.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b80609dbadf---piwijifutulenatafox.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c8bcce55---rivafeleribetirap.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b622322b053---13365695665.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8027e51def61a509373008a827086b2b/mokulugarubipodalon.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/5028743621.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/13747395895.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/risesowazanagumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vulvovaginitis+recurrente+pdfPDF 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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10928 bytes
SHA-256: df9c79c11ecd818649f9be7373a068edd6c574b22009d12f29ffc808604d848c
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 19644 bytes
SHA-256: c28406a00d50dd1edc87c705f01bd2c8c7d596ea9eeb710c496e693f5508844f

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