Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf6c11f3ac05d0c…

MALICIOUS

PDF

115.5 KB Created: 2021-09-02 06:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93d19444fda0baef4a13ce3f2f33a475 SHA-1: 5477c520769e692f157c83540a0bcaa003881d81 SHA-256: 6bf6c11f3ac05d0ce4c683cd486380e95d9b7154740d68f67aa4ead1a65e3012
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm heuristic, indicating it directs users to multiple external URLs, many of which host other PDF files. The ML classifier strongly flagged this PDF as malicious, and several heuristics point to it being a link farm on disposable or compromised hosting. While no scripts were directly extracted, the nature of link farms in PDFs often serves to distribute further malicious content or engage in SEO abuse.

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://citronixdeflection.com/nbloom/fckuploads/file/87912604074.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5dtkcfgfkl7bjqco9deldsma85/1898730235.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/62932935354.pdfIn PDF document text
    • http://dobermanncz.eu/files/60773505066.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/91220935572.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/84289042505.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2da800456---fizufitobasujijip.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xezegezaxibasim.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/96193988324.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/kalekogabixulusodidije.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a1aef6af1251b05feb28e23c68a6cdd9/54651782991.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/getoporaku.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/perudupagokuzikiwegojala.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/13588439896.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/15286511283.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/87720343832.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d05735c75d8f4ac9016f01ef975947f1/zevekusidozemibisofizi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/doxozuvetin.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b3167a2b---46333502710.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/t9mltu5fdkeumaubcf4v4dk547/zefiresesifag.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e135dd620c---46133783472.pdfIn PDF document text
    • http://wamer.org/userfiles/file/83612743179.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/74603774031.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/6000493779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=2+player+solitaire+1+deckPDF 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_off00016458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6A 16808 bytes
SHA-256: 54f096d6cfda75a420cbb11eef1521b010236f0d446688c5cc5932e3de161344
font_02_sfnt_off0001a7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7DF 10684 bytes
SHA-256: 7f964df06506a8e65faa694a4a7d435e71414f200132ff57f519e96e893e2a0e

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