Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e400fd9abd38f66…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 09:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f99de4d78da5eb837b0466c23b956318 SHA-1: f281d18a196c1fb45d635b6b6e96f1e42499de88 SHA-256: 2e400fd9abd38f66e291c61cab612f57a92e1791f96d00cb0d77937e4aed79f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://unicorn.mn/js/ckfinder/userfiles/files/75247452792.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d48531ae6bd---zujuleledikiwolapokurez.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/23756169594.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9b9415ea---lubidinatu.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xemadipesoderoku.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s5pakabu2ljg76jla894q2p652/kajovijewubibep.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m4aqstup52nh17liomitksklmn/safalojojekexosel.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210702_183104.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/25386332114.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/logotimerimodoxuxarimex.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/72660163798.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d66283de7---roxevasupipinajiler.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vulexalosatujuve.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078de97640dc---wesokitifulelotodap.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/e6ebirkctanocr4f1qlmp8bne9/55436793380.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/84235021698.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/kitokemes.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/56282828432.pdfIn PDF document text
    • http://stevis.cz/files/file/bizabevazamudaposiki.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/85995132261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+inches+is+in+a+yard+stickPDF 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_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 10872 bytes
SHA-256: 83edbc918fcc75a06cbd385092fd0f44f1c5908b280d70c048174ee1c82099db
font_01_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 16104 bytes
SHA-256: f7f2b296b637a8f2fb433d357bffbe4d89264444296cdcaf256dfb74a59f2773
font_02_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1