Malicious PDF — malware analysis report

Static analysis result for SHA-256 33247e445ae422c2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 02:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84b6d732a2523bb7a3e81fc5842a6c4f SHA-1: 6ec6d5565f71d7cc9b38b30d6a53a79a79ac161c SHA-256: 33247e445ae422c2ca50b7764ffe022b9e01d5a8341595335be9621fdf6f99f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents as bait to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://fsoa.cn/userfiles/file/18312267700.pdf In PDF document text
    • http://dentalcenterstudio.it/userfiles/files/43253816655.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/kotakazemalanilenale.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/gimopuri.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160773296cda62---gevijarudagagijedipama.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/37163451296.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/xelijopamivekazilokom.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mizejopojipaderakasujewo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/41e9337b2edda6367b809e5a9c5c9c0d/rojarabajufodokip.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jupuwutowozesaju.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/155c27e6e33a43b91d5fe7f5f0485b59/bogowisatomuda.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gfsducjk1e5gt2acgu46c6i1j0/mudizuditewod.pdfIn PDF document text
    • http://millecolori.it/images/file/95604586054.pdfIn PDF document text
    • http://khocabien.com/uploads/files/dalogosojasaru.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/dipofonisujololif.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pesimidafipunofuz.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ebb0ddae---82714449579.pdfIn PDF document text
    • https://esvigo.com/upload/files/71548011654.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/84789770004.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/42621500007.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/sipuvomemamupeligusupi.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/lajinejamubinajigogosepu.pdfIn PDF document text
    • http://kag.fr/userfiles/file/rowup.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/72218978925.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/92627569742.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/30933720936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=las+48+leyes+del+poder.pdf+libro+completoPDF 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_off0000c63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63A 11240 bytes
SHA-256: 3323b6604daad84a422754bcf30896ad71e6d9373b102e56022bae13d3c6e5d7
font_01_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 19620 bytes
SHA-256: 64cab8a0211aebd983fa7c068f081f5c42cffbfdb5fd3e143e5678b9346320ed
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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