Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef3d77c0f896642…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 02:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1565228a137438ea47f1fa040292c327 SHA-1: e5811ffd29aabe89112e331c27c5b5b923766035 SHA-256: bef3d77c0f896642ae017e2b246df8685b566a48227028e8a1aa2a928cd3401a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics further support this, as they are common tactics for redirecting users to malicious content.

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 https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8b7caaaa573f2f99c974cd7919b22512/mozojujowa.pdf In PDF document text
    • https://cuatudongbinhduong.net/uploads/files/95487807569.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tabagofokixexebeximikebof.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/162122501521.pdfIn PDF document text
    • http://klinok-saintp.ru/files/pusiwitipazofutuk.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lthq5641hnls5fuiidhlabb1h5/wotesuwotopur.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pevidojasajusaxelikumufaj.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/xajalobefisunezu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cd6cb2187c1d39100cfe493661daf100/pejobufozugoxubaripabu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vafimewufenukitovugisevu.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/dpd19jhhks0o7ddi2f8tucbhf0/21526207319.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/91750362015.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/71274964277.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pikufojuguwu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e5b3175e699dfd42399f8cf70403812d/49428492400.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f2400bcf7deb084ae5a61caf80760ca1/wavodenifixoguretedoweta.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/visadipufenefokuxegubu.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/pores.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/84665675041.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5a4410474---85227226670.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kadejizipiterodiki.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/jeviwejale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=anton+bruckner+christus+factus+est+pdfPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 21752 bytes
SHA-256: 18d5f17d6bfc72eb72a7e379db639da8edd5a46233f5bd6a4ceed7a177f2c84d
font_01_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 10984 bytes
SHA-256: eab9b5e9c8b9df08c3d04a066bcefc13082bc9b318aa4c2930f5833ed5105874

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