Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bb601b53c843b4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 21:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f63be097a3043606bbb5f65a3541834 SHA-1: be0ce71e938823bd911e20037abcd548b13e4ce5 SHA-256: 16bb601b53c843b4c2a10df0368975569db87c731574432e02b0cbaece2f722f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://upasamed.org/Content/uploads/files/97182371238.pdf In PDF document text
    • http://www.drivingschool-brno.cz/files/files/39128027495.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/3285805300.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/77846160954.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/likagetusolasamaxisurit.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/7964855129.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ragamedixotugumatu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b3168620---41375204593.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/roratavakifazozivosigaza.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/30909956988.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/bonafoke.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/wemigeforezatevinelowulu.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/46039057672.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae52ca9ffc---54480705974.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24124379619.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_080B282B02FC9251.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/25186546974.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/jiver.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3989d76ac884f322daefa7672cb43297/jesulorevipapesitumimuw.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/mikiretasi.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vidukesukodisunop.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/34994616615.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/saxegilabakabegiravi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+ppsspp+wwePDF 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_off0000ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8D 16528 bytes
SHA-256: f42d149ecbf4b05e32d2d7ad77c444cb64252980c4e9511c0062ffa62356d3fa
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 9976 bytes
SHA-256: 6c95e1eed2544d8b205b50010edeef05a6d17b3c344f5b255e67f2e09790854a
font_02_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1