Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1a85f185aed975…

MALICIOUS

PDF

81.2 KB Created: 2021-07-07 22:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e346922ceb4494948d6dae2bc4aafbdc SHA-1: 0b2752b6599594bb67b73fc62d24eee124151462 SHA-256: 4d1a85f185aed975c0839683e954c89af1bcef83bb6ee9f21e96ed04eceb59af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and IP literal links indicates an attempt to direct users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mwasafat.com/uploads/files/tufazuwukalamiwivov.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a62346c6cb---48082972615.pdfIn PDF document text
    • http://nensi.si/upload/file/revizatumakikewowodonago.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074951dbed86---luninotezezinin.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/61478467423.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/83066810326.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b3c66nhb84hmgglg7nbg53vl9u/lavamobafozar.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/rutomepajedu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/39911533400.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c1da41aacac0874428f3ff4795ed6b5a/81275832303.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/23062943846.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nuvob.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/53372177531.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2efkh5i2h4s81j9fa78fijrobd/42775259642.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/90942265431.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/85m3ccc7e3gr4dihofq9ke39ph/72739888834.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/52175268370.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/39970946354.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2436555b44---4694661961.pdfPDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb911ea63---48474987298.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/6281cee4e23b44d3bf0c5c609ffc7040/92007250518.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/gokuw.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/808d556dfd85c981ee7f16b7b75b14ba/38189491607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vocabulary+workshop+level+a+unit+1+choosing+the+right+word+answersPDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 15920 bytes
SHA-256: acb60ac4a7f104f722155f40655f7784effdf58081a9a36eafa5b01a35c0ed4d
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 11412 bytes
SHA-256: 2dd452c5f431815eff6a49b041b10ceb1e4b236c5643f1e816969311357f7507

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