Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e5251f4dbd48cd…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 07:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3af77c779c484ff0b278e5fb32b205ca SHA-1: 0503195ab7faec38839c4753eb975aa5c4ba10dd SHA-256: b8e5251f4dbd48cd404e7060902ed07a0d5dd4c3e08e9c6f08ebd812798f750f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'padmavati full movie in tamil' URL, despite being marked as benign, could be a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gshosnab.ru/userfiles/file/87097743692.pdf In PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/59012507628.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86445161867.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/46037885638.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91253550550.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/55001283482.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/budegoriv.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/8413941973.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/7015278654.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/24380817030.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210906171716.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/benemabituregefolopuwoted.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/94536083167.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/57944922109.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/45287046991.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9b1d599a9e4037cd6ac63ed9ee65c0b8/30410793411.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nizavepifofedefo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16132a91a26eed---1168394739.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kulezaminopameralek.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4877bf53b889c7fe4e2fe19cb4dfc32c/70068829341.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/juvipozuz.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/65577503652.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023fab4967---derur.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/4519681332.pdfIn PDF document text
    • https://laps.pl/userfiles/file/42481977981.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109051616265716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=padmavati+full+movie+in+tamilPDF 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_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 17788 bytes
SHA-256: ef96e1c86d85caf19633db1437904d667f4ae7a7e6fc1602147a3195a67e3996
font_01_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14205 10412 bytes
SHA-256: 527ec075f70f29a7d3c1d43996a9941b88a27254d02bd7c63b732948da9d5749