Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef00b55a68c453ef…

MALICIOUS

PDF

101.5 KB Created: 2021-07-21 11:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af07483adc97ab6a71b07bfd131661ac SHA-1: 6281865c0f2b63b7c409de89fc49222b7ede6be1 SHA-256: ef00b55a68c453efb9be881d3a7278dd94ad5a9530344248ba9912f62c385d98
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised or disposable domains. These links are likely intended to lure users into visiting malicious websites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6455

Heuristics 5

  • 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
  • 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://frutapacargentina.com/ckfinder/userfiles/files/95750852710.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2d5ea86b93f6e5d2610f9af9b86c9a97/18997534753.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/nasoruvekivufikov.pdfIn PDF document text
    • https://premium-house.uz/images/file/defexadenuwuxa.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/43406157371.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c404428123b---zaxerezerofum.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q8dtom6lu2q3fqc5r0onh8q27v/nuwurelapot.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/66786304973.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/puzisobaritozamapabepazar.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/51b1b4937bb58ec8bb75ebbd7a107334/85162476851.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3586b719---zojenimu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/25b28ca82387db130ced6e18cafe48d1/jojapawotugokogijorififoz.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/widuwubadugolopuxezirud.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///dapinuk.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/4391991856.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/eade6d65ab85da0d9c769aabfa37f543/32391240589.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4d8ecd3c---38371872131.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g0qfm5ucitllsdf0v6035ul786/31905037785.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lukikapuduludiwuwefowiv.pdfIn PDF document text
    • https://reniuved.it/file/70679108139.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/86634019581.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608829ed7d9c4---bofajedore.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3baaa644dc5885213e61244f4db2744a/dumubejowopow.pdfIn PDF document text
    • http://katachizu.com/img/news/files/pazinelufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=proform+520+treadmill+owners+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C9 18540 bytes
SHA-256: 35519ccadd14d6f1367e90a361fe0ebd9fe2def1afa37c8331162114738a0fbf

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