Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc16756dc3681e56…

MALICIOUS

PDF

89.1 KB Created: 2021-07-22 01:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0a6241e5f29e36fdcc9bbc44728a484 SHA-1: d91f4661020845c6e69db0f0569fc3b3ed536924 SHA-256: bc16756dc3681e5604309e5313e77689d79e0c975c7f7c289c7de1802a662544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d4ab9053---60939663207.pdf In PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/70166283072.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e6pd37k8gvaafagesbrqfal9h/tarotog.pdfIn PDF document text
    • https://daismene.it/file/bupibetaresuvolesunimaso.pdfIn PDF document text
    • http://midel.me/userfiles/file/38907986080.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/77391956364.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088382830da7---vokadulibiwanuxisigu.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duxalalesotu.pdfIn PDF document text
    • https://thechoose.it/file/tosoruwadewivojam.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/29400097204.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/legipifofapinuro.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/6899626807.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/746ca49793fc74c528a0aea2e06c3f4a/dubelurarovesavekegapak.pdfIn PDF document text
    • https://dm288.com/slicice/file/jediwoturesare.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160850d6b028c7---1245460166.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921532d4cbf---29776324797.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ca327743a7dba1af6edb163d8a869007/89842816458.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vebuk.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/dobuk.pdfIn PDF document text
    • https://ismart99.net/upload/files/26287091107.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd059c09043---lelajanivijakawejisit.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4eaca488ed---53782915869.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f05ad3d95---fumavadixarunowodubufana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+hanged+man+tarot+yes+or+noPDF 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_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10632 bytes
SHA-256: e84488ef43d079d84a97b8bfc802ec15f1ea743ae0fea86178efef16a9f8700a
font_02_sfnt_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 16896 bytes
SHA-256: 6b08eb83c6b9fa6921fc263dd3d9e40d0c1b537f23df72044e861c0ff3ceb836

Open this report in the interactive analyzer, or submit your own file for analysis.