Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4abddca68333ea…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 07:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39da12b31a9c6fe7e137b8dd1f2b0f05 SHA-1: 8a454b3f2704c9ac624cd85038179d89da981b9f SHA-256: 5b4abddca68333eab4706a7276d6f9744b9d855fff216a44a1afdec20ab4976e
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports the conclusion that this document is designed to redirect users to external sites. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://musik-fachberatung-neumarkt.de/images/uploadedimages/file/ribadag.pdf In PDF document text
    • http://huspanda.com/data/ckfinder/files/pimopitu.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/91986476018.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/26408279512.pdfIn PDF document text
    • http://synphabase.ch/upload/file/6781191957.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/zoterenax.pdfIn PDF document text
    • http://goldmustang.com/files/files/67778738640.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/48067769981.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/godafolibemofopevijipaleb.pdfIn PDF document text
    • http://amdind.com/userfiles/file/84279760864.pdfIn PDF document text
    • https://kuepancong.com/contents/files/medesuf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea3465f0b---kenatikagez.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613263319c684---jipaxamevibesupepegijor.pdfIn PDF document text
    • https://partnermind.cz/images/files/tifosan.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/94062826815.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210917010043.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zuzivibifefuxonosawetulo.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/95814203358.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/vurilapofusewufuwuxani.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/60130471057.pdfIn PDF document text
    • http://eichler-kammerer.de/72852181297.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139874e5f42b---wexaz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416aa6062e3---56045710455.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2421376a---toxirale.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66828697952.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zedizipitida.pdfIn PDF document text
    • https://mimpishio.com/contents/files/mejomelijixubakuwemiraram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=family+guy+pinball+apkPDF 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10400 bytes
SHA-256: 30906c274bd9abff90e9c416e277af27b61acc93610f1ac6457f3ef61b114f03
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 18324 bytes
SHA-256: 5ff7a61f2ae0a2c3e198af1c673556827494206c5d8341f07b8755183ac65273

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