Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad9728bcd0e4a7a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 19:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65e22cb5f1ad6af7f8b500a89590bd0c SHA-1: 25fdcfbf7b2ea0b2d369bba9886cf42ed89eca72 SHA-256: 8ad9728bcd0e4a7adf1b4433e1b2e84f5861861a3a7a6f015002f43f7899f345
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest the document's primary purpose is to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://oniceh.ru/uplcv?utm_term=imo+versi+2017 PDF link annotation
    • http://kdsonline.org/userfiles/file/93769871410.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/10744640681.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/wufitolisugefogiwemab.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/94298233686.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614325ff9a56c---nupekizuzonifitajeweko.pdfIn PDF document text
    • http://christopherdallo.com/file/porowokigajivabawapuxagos.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/58455195328.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70822065926.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/modomimu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf1d28078---47409200996.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/86547256909.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/19693077608.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45675620832.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a93ef3cae2c2a6753816ad363430ab15/24102750757.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/luvaxifawabijumimuzed.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/13866347358.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/votufuma.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/rutekasiwetuparedefiwulu.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/66749556063.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dosavumek.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/tizumalorad.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/44769446593.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d61a78813---zalumabujaxururuvezis.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161469e57e9da8---32631169642.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/nusoduda.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135758b04573---21393331583.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_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 10220 bytes
SHA-256: 859fd8e5bbb9bd3ec0e08e90dc2e5f9487749a73de4d55f8be668aa96035f85c
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 15920 bytes
SHA-256: e8ab06815e1e24c1ca0b67a3722ad046bfed7003b4249a5aa9fcd63cdab7089a
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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