Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c15fba3f91fbc68…

MALICIOUS

PDF

77.2 KB Created: 2021-09-24 00:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2f7f82556637ab2e8ecc90c1d313ebd SHA-1: f55ed8b72b08175c864def77d7846533f17aa595 SHA-256: 1c15fba3f91fbc683b99e088362304e39888f9ec0518cbd224bc5e7dc78c997d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://acavacecio.it/userfiles/files/tagazuliberegonore.pdf In PDF document text
    • http://dietetyka-24.pl/images/files/teduwetofutezuzaz.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/vanizalalalugelitelasum.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbddc9e4dd---31532753131.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141caf1ef86c---vuvobazipozubej.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/46499500820.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/paxegorokemuj.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/59066934782.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/92932738399.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210905_9ED66D9D24BD8587.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/62596354114.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04889dc33---vaputuvevulekogesoravu.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/41712474723.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/losinomalokoramela.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/41195614061.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/15944222248.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16143af86abf82---kaxutavulux.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/46710052308.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/ludonu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-23/20210923105339890375.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a839055e9e9406d27bc718e6731dc884/xukuzezuzojanisoruputorud.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/23209171102.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/kilejefakaxefejewenudib.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/48273044428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chal+mera+photo+doPDF 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_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 10324 bytes
SHA-256: 026c72f60200bcdc7ef10c5e03cbb7bf330342b8e48df83c4723cf01e5dd8e66
font_01_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 17352 bytes
SHA-256: afe5285e2493a8a78eec0f6e1a7652ec3d3f5714a10fd2873e482ea75ea72f95
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1