Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be4c483ce97b0e1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 22:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 808a0a235abe0592b63b4747f3a8abdb SHA-1: c26cc77f8e005dcae661955b64abc143e7e3eb2e SHA-256: 3be4c483ce97b0e158e0bb622b5ccae39203793c673b13a4aa6ce901c60087e8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=fainting+after+urination PDF link annotation
    • https://jungleflightchiangmai.com/Uploads/files/raxabopuxenemezobi.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/rezusubok.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/poloki.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/2681645395.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tojijabuzoz.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/68034933667.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/tozigipejolo.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/11479636430.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd58dcba2f0---11087559647.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/luwilowofapujupifiwanut.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgg4ugqk4hfus1opmcntf7kc4f/43096013148.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b03e009790d3d6a92b2dd7d602295096/poxanulixuzi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ad33001584bac156b0aecd44a2c7ce7f/6042744885.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/wosikajisukululekido.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/05ef2a558c7607327d1534640ba4dc2e/97376005415.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16095f97e9fe47---97476080056.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27166339674.pdfIn PDF document text
    • https://edbcagliari.it/file/vixobezidowupamugamin.pdfIn PDF document text
    • https://hssanesteban.cl/files/30364415451.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/jibozitobivowura.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 17796 bytes
SHA-256: 6fcd8d6a4b4c1d8e2ec70accfd97ebe737b611963d3fa1ea05e5c7321f01b9cf
font_01_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 10252 bytes
SHA-256: 9be148ddfacf6f9c92bedb031de2191b0e89548606e870561d81f67f4e3455c1

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