Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e7defa82e6dbf…

MALICIOUS

PDF

93.6 KB Created: 2021-08-17 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fad1ab1211a2a8f2280ae0642f9d6234 SHA-1: 7d55d166b50c30cdc6b5ad314ed382175b0f2162 SHA-256: cf7e7defa82e6dbfbad3a426b7d08834a11d9b083bdbdf55856f8e46e967da82
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72daaa01d---73473729553.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e3c8ee0a---89795542912.pdfIn PDF document text
    • https://ubranni.com/uploader/files/31904531043.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/zalama.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/40ba73bdc3b0b02b8c8a9436b1d0e66a/fibinosidafojovula.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679be2f702---94733247378.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/tonokokejatadopitoxok.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9eb3000f0---serazasama.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/42774201360.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c9889450572da44367b40e4c9c97aa2/72065626964.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///buvedovav.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/wufumosubokuzojoluzoj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78665441034.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/xogikuvobasumutonazozo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/sezavoduvemuw.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0b549524439ea68c96e813e04626254e/54498696052.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e265de609a205b8422a8e222cab240b1/75646511516.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/22406042827.pdfIn PDF document text
    • https://sinarwaja.com/account/files/46323291616.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/64037588817.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c9f03ce4---30418561602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ab+roller+wheel+exercise+equipmentPDF 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_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 17000 bytes
SHA-256: 1e9215b6ad19deff965c5b0d3d1ce478f7acce9636a80002accca5026aa525d5
font_02_sfnt_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 11032 bytes
SHA-256: 1efc883920e064eec66e2600c222be8d3b17512cc0bf17b91823258f127b1b73

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