Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0428d9f400ec24…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 23:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9e8105ad2a9790ac377feada6204de1 SHA-1: 059c162e4089df45bb67e215b4e88bcc53843ec6 SHA-256: 7d0428d9f400ec2408ef5d13f638be9adf9b034b2d65ecae0cabdd371bf2c861
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point towards a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archifolder.com/userfiles/files/23802568058.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ico2gsq62l2t337kn95i9euqq2/pomapurorarojabosabeg.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/54457736960.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b270ccd6---dapunuruzopidunonapuzore.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/78946439297.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/45787192862.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/vutufejedo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/mebazisafoliluke.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e4b307c48bf8e46c4774638574839699/18352084530.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9fe0423e---44691392718.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a0ad44fd7e1bc195414a8bfa8c9bda71/zetagokofoxatove.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/1579515446.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/94826681922.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609320b1e35dc---31205339669.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wukemu.pdfIn PDF document text
    • http://thevale.us/userimages/55201659264.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/siwinajuse.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rubeldt45gerpnbj3c4ok8qu95/fovotowapepekuxum.pdfIn PDF document text
    • https://amgaa.org/temp//files/8089796980.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/25687377887.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210703141229.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/76302711437.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kwentong+pambata+pdfPDF 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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 10652 bytes
SHA-256: 1715fbc6c6a7b003c7d24cfa81c9bac34cef28029b05b716009c261ef46111dd
font_02_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 19348 bytes
SHA-256: 0cc086686234b892052443645374120d78b5a9c44836e7c04ca49e792be62fc6

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