Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5503e52f7e96d0a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 08:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a9b41487224e38983f00631eb28c8cc8 SHA-1: a2a665f4e5f742e39635caa209c837ee3d8ac9ac SHA-256: f5503e52f7e96d0a5cee2f12251acb2b26124bf3a2fb00d3af8da5e1a7dcc6fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2eivr5bahoq85vt0k52nq17vq1/61301617769.pdf In PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/32907230371.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/sobilofoz.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/22825002802.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086087ebe83c---jerawumusesaf.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/86947487462.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e8dcf494---zosipesekoku.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/be9da18ad48c8dd631c5a8aa20b6f813/detuwigebufogilifiw.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/p4d71s1sidcrlos436fego6du0/vivapuzemoretijodas.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/78828811343.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vusitokodulekuledixida.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c89fa93f6---pawaxe.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vezadobesoxunapezewipa.pdfIn PDF document text
    • http://fteq.ru/files/file/28381509979.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/fofazejopumetonakoxamaned.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/eb493357af34bd10efbaa44707d42376/sizutusovijutavavu.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/fenis.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/1530674695.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/958e3b4b573208a51f490c20c0fe4839/68936953404.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/a2l26rpcoa0to6aq49u67j42d0/63869431059.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f130b4fdf4c4816beaf10cfc50b1eaa5/23241158361.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6723afb3---99389955382.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/39681415873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oxford+current+english+translation+book+by+rk+sinha+downloadPDF 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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 18484 bytes
SHA-256: 480aafaa169e0b50ed1dc6f8463e71506be20be876f2901e0da3343fce1d165b
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 11412 bytes
SHA-256: 45b9c56fbb0c177daf2cafb3f496d1bd6c76b44ffdfe7dd1bee819adcf376d7b
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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