Malicious PDF — malware analysis report

Static analysis result for SHA-256 1967e1801c38ed08…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 23:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d047741e95c0a871d6ae851ab5b4234c SHA-1: 64750c445d03d0ee1845ebd6bcab918726ad3cda SHA-256: 1967e1801c38ed08162818b418e2b3fe9435a75f5538b30be98fa1eeb5761427
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://www.nbc.com.vn/ckfinder/userfiles/files/regoguvivu.pdf In PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/88516262377.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/remopazemobovaluxefo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21716bee---99195477637.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/66369155486.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/loximusiruselukulet.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/wigeged.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/fesozesufuzut.pdfIn PDF document text
    • http://skupka54.ru/upload/m/5791776175.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lurujugisudajegixanogil.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/84508340202.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/933315cfb01fc00c34ae161aa8d86fbc/vepak.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2a6bf7721a3aba5da383c34e32899df5/fafewunonapin.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/41675445249.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7b349771---17627128286.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/60436712053.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/16021934708.pdfIn PDF document text
    • https://blogsma.com/files/budajinuguropupijos.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/73348822740.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/lagebojijiturelevog.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/57173371798.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/dasaxalozexata.pdfIn PDF document text
    • https://premium-house.uz/images/file/duvawa.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/41612040218.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/8850774685.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/27706452643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+recover+deleted+videos+in+mx+playerPDF 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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 11036 bytes
SHA-256: 537c1d39c2ea7a4823b7dc4553a29182492745d9083d6f874ac979e1e590bbe6
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16556 bytes
SHA-256: a3672a7859e67603f88ef6013aa6982659ecfcb916226f3f5755887f049b23c9

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