Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60e1b856d4daa35…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 23:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 37400b5ab35be3027d93dc82869ee358 SHA-1: 0902a7ece4ff9cb2f71770512d65b5d14beaf562 SHA-256: d60e1b856d4daa35ef753c3d5df38380c2e6cea9453693849bd9fa50af3eb2d3
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier strongly supports the malicious verdict, and the presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=game+dragon+ball+android+offline PDF link annotation
    • http://abogadosaguilar.com/ckfinder/userfiles/files/kokuremufajuzoxorupom.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lijon.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/penojilorijuxepokad.pdfIn PDF document text
    • https://upaspor.com/resimler/files/zinofug.pdfIn PDF document text
    • http://szjg.hu/images/file/96727463156.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8fa94e5e4---8410873116.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/woxorige.pdfIn PDF document text
    • https://cargotavio.ru/files/file/rawimufu.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/sijizilipejiluxuva.pdfIn PDF document text
    • http://linza-market.ru/upload/files/66468540816.pdfIn PDF document text
    • http://lblussana.it/images/file/niborewujuzipasemolojes.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8f6675f3921c7056278fecd5f4af83e7/rotinozuni.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/fetit.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/48146222029.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/naxarix.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/7750006348.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614239399131e---83494012955.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/10220640027.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/tepedikukupulir.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/28597892152.pdfIn PDF document text
    • http://chicopharm.com/upload/files/lofumuzogopupesugu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rovanurajele.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/guxumexazijozuzo.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/jafewoderelitaw.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/22710617713.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_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 16904 bytes
SHA-256: 20cbeb7aa68c57495cf53f4ab335845066d783397391c4e3ea0f0a66f8c9c3b0
font_02_sfnt_off00013dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAC 10608 bytes
SHA-256: 218eb8cbec2ceda783eaadac40a57ed2752b8d92219d8b646165932c8a584b83