Malicious PDF — malware analysis report

Static analysis result for SHA-256 0212b2a8be56f7fa…

MALICIOUS

PDF

83.6 KB Created: 2021-07-24 18:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e924b46f908bd39205b28c538446ce07 SHA-1: 337ba59b94eae24f2b196f561db230f4f73235e2 SHA-256: 0212b2a8be56f7faaeb51f27c29b63b4325806709644cbf4c95dfd155391e168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fautographie.org/images/userfiles/files/99446150900.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5ce8048cd37db7fe46163e36dee0639d/95979610957.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0572bb3a15---14869333.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13834bcba---radebusamunu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8ab3bc7---95447119863.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/74568866620.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/52739b44902dd2706fb31be534ce6b48/263644511.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/36578812863.pdfIn PDF document text
    • http://toroisg.com/public/images/files/25411142095.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e81aa555c96042f52fc1e3c94fd9d565/lupenibijubifekodawaj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vo6iqdbjnl1b7p7jio8cfct7j1/nixezuwekixewepe.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/sogelifog.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8709319f5117fcfb8527a5fcd0d4d648/pubekutozu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/99ba2d532ffecb2096dcc52ec0cc79b3/85204298819.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/potafomanepobekufojavepe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b88557804c9e0db27e24b1a9755bc9c7/pogubujijow.pdfIn PDF document text
    • http://vodnik48.ru/content/file/sajodibimepajomakakaba.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/92147057209.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/rofosanigulibu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37f5fb827a---repakedori.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072348ac7945---59633846903.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zeguzaf.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/57485deef0460e4aa6c216c69eaf4c1d/jemubikerabeg.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210623_010320.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddf3d6d8c---23839905866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=just+dance+greatest+hits+xbox+360+downloadPDF 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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 11528 bytes
SHA-256: 7dbf81c5e03c33ea8e2db415b807c9d2b9a1d2211f05d20f697a0415ca64dc64
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 22332 bytes
SHA-256: ce4b22e9b36fc6c9712674ded9a0e8e821db97f24c5b2582dbb243e48f662743
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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