Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e77a2d169a5df72…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 16:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2448e61450d61f1df9449bb5049cf7fa SHA-1: 127eb60d97983852a3483a0230d0aae85d7345e9 SHA-256: 2e77a2d169a5df72af1bfd5eecc39f04b607de16ca4fc5f54ef7874e98b26d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=music+players+for+android+auto PDF link annotation
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/panaxuwunifa.pdfIn PDF document text
    • https://cncunse.com/d/files/jifupovazevugesulodeb.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/fuwodenegog.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/28830145426.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/19464119368.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/15775159168.pdfIn PDF document text
    • http://kvrhousing.com/uploads/46287136673.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061944238565.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/10qparn9muhbs7g772mbra3b0r/tegefepepolujanebob.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wajil.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/xidubulafilij.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/99388571606.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/16069089974.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/defatata.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/takonigikejuziribopero.pdfIn PDF document text
    • https://12shio4.com/contents/files/4478318370.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/91823439675.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630495316.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/40068740230.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/594duh0lba7mk310nc9b8gr49a/91441690551.pdfIn PDF document text
    • http://jsdarvin.com/files/20608578548.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/judew.pdfIn PDF document text
    • http://heureka-cz.eu/files/99211671551.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134a40d836eb---35327565673.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/51074559136.pdfIn PDF document text
    • 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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 10820 bytes
SHA-256: e8da04674efb6cc5189a7294325ded69b12bed4831991b462b3d1514a6892406
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 17884 bytes
SHA-256: 4f05885cc26b5f04992de0ba10862073f99018200b57b17d890fb3970f19e94c

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