Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4f5be95ca46a11…

MALICIOUS

PDF

92.1 KB Created: 2021-08-10 14:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a84237847b48cdb5919c8dbb43388ee SHA-1: b86f2bf1f6230740a930e0cb7ee8099a2981b8da SHA-256: 8d4f5be95ca46a111588272b9989faf7261f26b336857a373cc5b91356c46eb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=they+say+i+say+4th+edition+online+book PDF link annotation
    • http://cokhihoangvinh.com/uploads/userfiles/file/71736028583.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bukaxofidukemigifope.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3598088e02---29367023521.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/214a8289deb30b75e9f18c996e226f35/18765977572.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/3086729573.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/m5lm6rq0hp5urhrgsamh88lg27/98265520362.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4632a3b961131a92eb392f38943a86ca/39613438880.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082944d87806---41147796138.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/52305753961.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/549tsa2dv4act0gsrv9l343j13/pedosaviton.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cfa820428f44b7b4804c90272f1e2901/fejinusul.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c591cf52---vinomonosenogesojokibolog.pdfIn PDF document text
    • http://ipceurope.com/assets/file/86863498028.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/83071322517.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/pevodamiviwewomezasu.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/tuwulelojamemerisubibegag.pdfIn PDF document text
    • https://coluer.ir/documents/file/zuxogetofuf.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64ec6a9e7---bigogataxotakumuvinasibu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608888714ab3e---23360451972.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7i43leuj5kq6eeu060n3lnd7sc/39347794422.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d1583ffcaa2bbf1f06bbb9a1b81439e7/pemapatelisukegemigoroja.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070f70ee965a---nedudupufodalazet.pdfIn PDF document text
    • http://watch62.ru/files/files/39008458223.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/93132746611.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/gufunasepor.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_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10632 bytes
SHA-256: 313ba776c747149866a4795d30c8b1019567a687065fdc73ebab1079603d2170
font_01_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 17096 bytes
SHA-256: df6327ecea8e1eae1eacf3faed20068e61f646f6acb9e7635d69fadee67ac549

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