Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46d20a3f8fe8692…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 01:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75fb5ef7ea210e2cccdc00a820a9ca14 SHA-1: 85789679f4d7e0a183594f9357beeea76a32d80c SHA-256: d46d20a3f8fe8692a1b069de5c0014af08958d51ed5efe6c0d4f35819c23983a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive link farm points to a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=how+to+convert+rpt+file+to+pdf+online PDF link annotation
    • https://optimustelecoms.com/ckfinder/userfiles/files/29009885102.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/960a49e798b75b4bca023e65d5ed8fac/83274346250.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748fb4607b8---79038596850.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/wugaka.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/zefamuwaperukogoze.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/lolofasovasomowovotope.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/gj5bisne28apf557uktguekv2t/bosusapabotejumajixax.pdfIn PDF document text
    • http://kustari.net/userfiles/file/fowegegobedanavemo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/66e1bf79dddab50a1039f4c1956222f4/35105809660.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/galarozapivenejeles.pdfIn PDF document text
    • http://rayer.cn/d/files/joluxibixadibop.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626958829.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/wivagedujukakutabol.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce672afc91---78624237438.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b74ef5d2c61a6f51b573d0f332b2711e/gakojolu.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64250851831.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/denalemedagufojusukekeme.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/tisezawigub.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kufewamewegupizetuvizis.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/fegepexeviginozurili.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/jobasewalumo.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/70680212738.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kujujolizofifedibupiso.pdfIn PDF document text
    • 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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 10428 bytes
SHA-256: 8eeed803381300e53f27bbe6427d249eba2987ed4cf17520f01d8634ec6e2a01
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 16952 bytes
SHA-256: d2faaaf1ec3a693a1a0ea5a0348c3c4422b28a82526f90c3257b386e72446a5f
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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