Malicious PDF — malware analysis report

Static analysis result for SHA-256 f778cb83210bc23d…

MALICIOUS

PDF

90.5 KB Created: 2021-09-06 08:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dbadff4dbd1138b0bc00a467b534d90 SHA-1: 088f3265e466c37a75d9799f79e5bd00a1fe600c SHA-256: f778cb83210bc23d2789e7bfc79e6b0b8df3b77fd81b0e4735a7aabd30cbf8e7
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dooroc.com/tk/upload/file/mewenosibabupud.pdf In PDF document text
    • http://polipack.ru/content/file/jaguvevalojakiwo.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/murilude.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0ea774601---xasinu.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/46322001289.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/gopitunurarit.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gokusemovupejowatuzaluj.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/saxajogij.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf20bbeaff---somusininezofi.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/786244179.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/59080046522.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c0d4e15d49332c2d73a25db8816075b7/voduxutuxewigogivaxikulu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efa9ddcf8---17399473496.pdfPDF link annotation
    • https://menu2uplus.com/images/file/davex.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/12140675127.pdfIn PDF document text
    • https://777mto.org/contents//files/fajixituxigilozade.pdfIn PDF document text
    • http://vizcsap.hu/files/file/75919895967.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/girit.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/gudalaxawujimikulixos.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/gutif.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/tamuvaxikiwazutataboba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=osteoartritis+degenerativa+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/gevitinewojijinafilom.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_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10720 bytes
SHA-256: 3f3804c061468fb7174a3bcea4aa80bb2072886017f9e8b50e436fc7ccf6b1ee
font_01_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 17528 bytes
SHA-256: b82f9b1a9904f4cd5a67821744b5675efd70bfa267e71d032d7e952e9fe1a26e
font_02_sfnt_off00014420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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