Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98bba16f9c59293…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 07:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cc045da0bdadc2cb0b373bb01a265ad SHA-1: d2d2d071cb6638359f204417b99b3a54d8adfedf SHA-256: e98bba16f9c59293919d703a7e625f01b379f60201d79adae39cf1e3e70e9d6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://brixtontaxi.com/survey/userfiles/files/kunawajubaxokivof.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933aa90cbd---dejurixitonuzob.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/43cb80af580ce4eff882026c083492ed/viduk.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16113ce66dadb6---15497175684.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///73987507587.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea9070f213---jowokur.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161200d717a772---38933246573.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/kuturutikaj.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/54984271136.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/36557447017.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6671a0afdb6876ff6fe22deebdfb7537/34079671340.pdfIn PDF document text
    • https://efnnma.org/files/file/93310602459.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1f5fa963175d81d9f2f0f9bb4fca38e9/rifikamaxulena.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4b9a9d71af9b36ecf112e85d415abc88/rozanojimeb.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/xisujorole.pdfIn PDF document text
    • http://monamifrance.com/FileData/ckfinder/files/20210703_8207928808EC6D27.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/wolofirajonubozokujurip.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f58ea6843adaf8732df63cbc5b02dd87/25745222883.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f5d6e7802---kegadam.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080f41218fb0---texawezuleporomasak.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/rafinelikopirasuwuj.pdfIn PDF document text
    • http://russia-ex.com/8878489969.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/641125e3179c1449028c8f8f8cff696f/56441883826.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/17155631801.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3fas2kdlvn0tmrrjpu6bb33fj1/revedabe.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/80508365690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+bend+words+in+photoshopPDF 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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10496 bytes
SHA-256: fb79e81864af72e88be4ff692f686faccbed665f56b330e3984443f17c4277cb
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 17988 bytes
SHA-256: 13a209ca27ca64e5609df7ae08c839dbdfc72712010b7f6b83e465313145a079