Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da5331a20fb88cb…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 10:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d00c25cf7a68bdb20bc4bb4b63beedbb SHA-1: 8a986baa59460f5d6dd08e12334e2a95c47e2c46 SHA-256: 3da5331a20fb88cb11ce4551498103b215b4a0d6538e41697c0c9732a6cc1bc7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using compromised WordPress sites for hosting, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://residenzaeden-albisola.com/userfiles/files/27797508864.pdf In PDF document text
    • http://oawebserver.com/piceditor/file/jazixodive.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/57029261492.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a765526d---gazowuzuwivep.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tetu7flujn28pl3adalmnel4fn/zotuganebuxuxatewapi.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/75027731171.pdfIn PDF document text
    • https://mkontakt.com/dat/file/20024612054.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/ririd.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/69124372595.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/famut.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/juvama.pdfIn PDF document text
    • http://laserinnsbruck.com/static/xopamenobututebukize.pdfIn PDF document text
    • http://poliinc.com/upload/files/37513499071.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910045645_udgo8z.pdfIn PDF document text
    • http://sns.hu/_user/file/42838341730.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dojejok.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/zategebawufonavapi.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/88437330871.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/73449183584.pdfIn PDF document text
    • http://koala-al.com/d/files/niwelipexoluneguwejo.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/50198698540.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130281846be4---jatezalegezimo.pdfIn PDF document text
    • https://12tiga.com/contents/files/puxetezuwafesarimibi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tilupigukomararivatupulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+best+hd+wallpapers+for+androidPDF 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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 16904 bytes
SHA-256: 87c535e4b53cc907da58f6479aead01e6fa2457b374ff3c879db74e07fc006fd
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10784 bytes
SHA-256: 9dbd9ee1f0044cbe9a060bb68d2426e0ad698059d119f71d2edebba21701daeb