Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccec5ce3d6d597b2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 13:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9edbb7c231a775153cb2e84d424e5c17 SHA-1: 0c0fc2f2447f71fa35d9fc47c4d21388fb2f06c6 SHA-256: ccec5ce3d6d597b2d3b7958e50adc49c366dab594b95a7a87c42ba12a11d245f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised websites or disposable domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the primary function appearing to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://4998horo.gmmwireless.com/contents/files/69860590790.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dkob3nadpc466rc42lugef8ko5/napakakunoku.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/911da5fe0f88accae4e9325fb59ec735/23880577390.pdf
    • https://universal4shipping.net/userfiles/file/wikipuni.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092768cc3a4b---sawigipowetajojav.pdf
    • http://ufnk.fr/app/webroot/files/file/4420389008.pdf
    • http://srutimusic.org/userfiles/file/fudusoxuzomoviveb.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/19205379732.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/zuxevewebo.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/17731638139.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/49183851727.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/f9f28km3eg2vc1o4lahbht46i1/97021986227.pdf
    • http://morard-mcf.fr/data/Files/nobunusadokajimutig.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/jinamiruf.pdf
    • http://www.netcorp.hu/data/editorfile/fagivewur.pdf
    • http://ohappy.org/userData/board/file/lofiposusapimovegakazika.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9176100437---10921049761.pdf
    • http://kodemari.info/data/files/wotovusigodutasuzagogi.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c149bf243d9---87341534468.pdf
    • https://oncetrabzon.com/resimler/files/netenenetapurazakepi.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/38281584675.pdf
    • https://mvservice.it/file/99693988727.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf83c64c7---zodagawatorejokurogesuner.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/13138060933.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+zehabesha+daily+amharic+news
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c395.bin
8e223d0c09bc4d191ce7f88db0e294b39f97bd5c52e51080f03075b271f61780
pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 10924 bytes
font_01_sfnt_off0000dcc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 16792 bytes
font_02_sfnt_off0000f4d5.bin
4d64a1fb054643afdcc73f514f2bf0fecd5960c76914b5fc79b70a87f6d2e58c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 17776 bytes