Malicious PDF — malware analysis report

Static analysis result for SHA-256 438367657214628b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 08:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1463a7c1fac96ce1500c6559ceca6f28 SHA-1: fa7b1864d5182ab5b49b0e92d03babc1e18362b5 SHA-256: 438367657214628bfd1e7bd90b72ed73e8df1a878cbe4b602a47aee7da7f302e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous external links, with several pointing to URLs hosted on compromised WordPress sites, indicating a potential phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm behavior is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vildmarksjagt.dk/userfiles/file/tuzuvu.pdf In PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/kilogo.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/libavifofuv.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/ravafodijimimewu.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/574b644caecddb055eef4fb37b14ed6e/67522484785.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/37759395867.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/bekuriroxafarimiredupufi.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/kuxukesobutekexi.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/14338235534.pdfIn PDF document text
    • http://vleek.com/uploads/files/zivawamowe.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bae0aeba5a2f1f2fcd90455d5e087582/wudugebabadutumivubenag.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/69040672753.pdfIn PDF document text
    • http://protok.pro/upload/files/rawagibavuzeginafedowuwuv.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0377324a04---masidaduwukujuveliwibot.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7s39glc92hqgq3tr4oj3gtu7ef/13440794595.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/83d163c57b8cb5c06e6fc40ff50e2c9f/71866288954.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe355f856f7---seguxabudofelokodol.pdfIn PDF document text
    • http://tai-group.com/upload/files/jusijunatuwufibiweditize.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/57bed7dadcfa0faa44df3a2788978d0a/89123712486.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d79e21b7---78425266449.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xeretimekikidal.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/4053735750.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zavozapesirexejiviwisexan.pdfIn PDF document text
    • https://unosms.us/userfiles/file/97059833856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=respiratory+medicine+pdf+free+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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 11024 bytes
SHA-256: fc4342cf685caf6e8e0f9c0565534c0d2ba89baaff90ea641b40ef719853a72e
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16528 bytes
SHA-256: d10719850e61168f47a50fdf06dfbf8ad1ef1caec1f558f0c87f83c81a85aba8
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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