Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dc03ade5eb912d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 10:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de7eb2363b5a92c013bb2fee1bea5d36 SHA-1: 2e326ea2f1b3c1925c0c9edbc08b92d31595c9f9 SHA-256: 59dc03ade5eb912da0d9f98dbd9992d7fe75a5d04f7fc023d05d6cd59c0fea91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with some links pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to direct users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=2013+mustang+v6+weight PDF link annotation
    • http://palenice.net/obrazky_clanky/file/kiwotelaxiwifutoweruga.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/44185937148.pdfIn PDF document text
    • http://ttc-investco.com/img/files/suguzinafujefamimolinevu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bde926411c7a99dd7c2ecdf055a9717e/10378453696.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/44173164387.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c07b632456b7f9c6208c0636a37a3a49/90525098182.pdfIn PDF document text
    • https://mylodge-naoshima.com/76308172828.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4369e5a46---80534524679.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/7162626052.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210616043533356.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/22916978407.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zupukubabijosunevofedeke.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/wumavisevezezewebar.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e69e62cb5---99112708577.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f6c48115d97644efd999e23cb0cbe2c4/57283204878.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/45274281945.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/64358590127.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hg384t43gprov8i6mdra70jc76/6256653308.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/13735549143.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608525539706d---51129346159.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/5193265260.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/57115790134.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jinikabazofujesedagomubu.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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 11076 bytes
SHA-256: 5cf7dd326ba1c78e13a8a403cd618d97ee1bd3d1798b79f4f0123fcb5ba429a7
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 16596 bytes
SHA-256: 7df1bcb86b3786c442f9a2b440a51e842eedd2f1bfb71d85bf22862539dd3074

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