Malicious PDF — malware analysis report

Static analysis result for SHA-256 228405e8de2937d2…

MALICIOUS

PDF

85.6 KB Created: 2021-08-23 16:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4e8211857122ac701a6184ee4075b6d SHA-1: f1ad8f6d6486ecdb3c141cc12c7d4cb0cabf8366 SHA-256: 228405e8de2937d243d10444b7288ae8b31938d85c9a431e67242effd24ec564
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are flagged as link farms on disposable hosting or point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fairtradeportal.pl/userfiles/file/57572405695.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/664d0cf17184148391b50cf153d2b76a/7781551060.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28863793f2---sadidepexixaju.pdfIn PDF document text
    • http://contelex.it/userfiles/files/14349168043.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/nagojagudikubuge.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/14166241513.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0esmo6sq2oq7p4nj7dlgo76r1s/9126817939.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01ba6176b---81200063641.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/rotajaro.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/lamajajefav.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/40jlku7jnjl7slptso38i86t67/pozusexitamibiwemufu.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/25315505153.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/remorisebudilolamez.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b047091e237---98080883893.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0a475eea9137d499bc1c8fa39d6723ed/85428329749.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e176626e033fa40f805921a754a828e/fotatunidexatisozuj.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/balolilivavapezit.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/91ohnkjjdd7v5bkd4njmfehdh3/54610474510.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/21931672979.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e523d000---losuxuwuraburugopinexumav.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/58359393107.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/18227793797.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078407d855cd---xanekonigobanidikaj.pdfIn PDF document text
    • http://jucal.es/images/file/puligetolapetavewitemoba.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094beeadf0d2---romazijabekujowu.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/29695143790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=inspired+synonyms+englishPDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 10644 bytes
SHA-256: e860dcb8da8a883e090911d439e6efc43838c0c2aaa2c812555aac067534a293
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 17864 bytes
SHA-256: 52bebc9ad49120728d3725195263b9274b94d1ba8a0a9391020fc4173df8f488

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