Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a93ed56aad8e596…

MALICIOUS

PDF

90.6 KB Created: 2021-08-05 07:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e9f6af86063d2206b1e201f52a6d12e SHA-1: 1f4823d0f91a1ac87beec087c118332b6cd45a99 SHA-256: 5a93ed56aad8e596cb1391c851eab25a056c329f496d18d5866fb694bc6c573d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple links to compromised CMS upload directories further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://lyzjkgm.com/d/files/bulupifa.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bejupebuf.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/4192922707.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/buvaxonefujunikakoviloxav.pdfIn PDF document text
    • https://hgb.se/filer/file/noxafowalel.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2dmjd5kjgl8j13td9b2cvtaikh/resuniwijoviderur.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/mowuzolixajajotoberaru.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c314a55b5a9---muzexibadil.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9749a9e8cbf1efdc3e72ff68ef1c8c02/60499065094.pdfIn PDF document text
    • https://campermagazine.tv/public/file/puzopagubabomirisexu.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/52560384328.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7170e13d01---6955471565.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/63878323418.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b6fd8fb9876d80199efac2e87fdfb66d/52738033935.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e7dha9p6s8vuj7kja3ng1bidg0/wuzejijawikeb.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/facfjt1lvpciqglcq7ih7vvbu5/mukugodigebolezitot.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e754d405da71b3c8e0c8518bb374fe7d/35815362315.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/goxifepezabam.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c3d4b931---90170368014.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3961af47dc08782d6a0688c48a21fe6/92340337469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=los+chamanes+de+mexico+vol+5+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/57001126321.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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 18748 bytes
SHA-256: 171547889be84985069390b4f4d8f6c7274e9d4a0bda98a1bbfab3ff02c13852
font_01_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 10944 bytes
SHA-256: 05b762c03107db281d991a23b61787e5214f90ad83b591e5ceb38e2bc0ea8163

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