Malicious PDF — malware analysis report

Static analysis result for SHA-256 480a8291bdb847d4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 04:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 089bc422f807a153a58357078c38b7c6 SHA-1: 1c57ec04b127231df01714615728d78f419d303c SHA-256: 480a8291bdb847d43c28f6e486b7c6357030c14b587834b9126af087973afdfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The presence of multiple links on potentially compromised infrastructure suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bioaec.com/userfiles/files/kivawuzizawemudupunutab.pdf In PDF document text
    • http://csc-028.com/userfiles/file/20210914082339_n7umvf.pdfIn PDF document text
    • http://parentini.it/userfiles/files/virasaluluwavejufuvuro.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/73402116608.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/54730067173.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ae94a74c---sajewukazetelekogad.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/44137048674.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/63356044416.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8acc1b1f1---81532651615.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/nudosuxofufijofu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/23768245352.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/fekos.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210920_225707.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614550022e1da---36535158487.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/jipojifowerigigutagevoduw.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85797659714.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c822556cca---79404636469.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109240045508156.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/rafirofaxe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134577af0d6a---81264640535.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210923214308.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907190142.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ea68lldh1490qle7im1aosfsj6/gopiwezapezibafixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=modding+guruji+websitePDF 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_off0000aef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 16312 bytes
SHA-256: 51a29ffc994a63cfcbc9e957cfaaf58c9b9fc33805c48ebf0844179c2eb1b0d6
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 10664 bytes
SHA-256: e0d37324b9068259ce6e33beb2bf096877428b348c3e08c24f1e785b7e6d464d
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1