Malicious PDF — malware analysis report

Static analysis result for SHA-256 50152a4f9edb9313…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 15:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f4185791559397112f6b3a56d69a5c8 SHA-1: 9f343d62a0d4d836dd85e5cd8febb112a1731689 SHA-256: 50152a4f9edb9313353a2d8d769560f8bb052a43a71007a40b231d7795ef8624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=3rd+semester+syllabus+diploma+civil+engineering+pdf PDF link annotation
    • http://roocenter.ru/upload/file/99241511984.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b91771ecceb3772545cde4cacb0e0c3/88276693773.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/rugevutimokofibajexon.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89300933353.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/pifowerifilelusi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872bf620dce---pubuzebanofezudaxisenole.pdfIn PDF document text
    • http://regcureguide.com/files/files/wexadivupofig.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/60993834027.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b07d2f52b67---zarevoparobe.pdfIn PDF document text
    • http://fabtur.ru/upload/files/76539935808.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad521d36---zosifezisatokinubomo.pdfIn PDF document text
    • http://dd-eng.com/files/files/80746356253.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a26771e5889---39835607147.pdfIn PDF document text
    • http://fruitvita.com/files/files/dakiwireneputuwodatibe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/867408d3229ca45e35d509c9fc48e93e/bejugukewizimumufarujode.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6c4762d408deffecbea85b24748adc92/takol.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b2017eca5321406dd5fa3f824cafbcd1/54502384825.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/29417056597.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6d4adee77cb1e02dc697564db98d2e2c/gatap.pdfIn PDF document text
    • http://christopherdallo.com/file/digoritexilulobadi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3c1f53cbe9dee47f5d36e4903f916b14/fadutas.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/48823468090.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163409cf2a4---62997781872.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/17357430962.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_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 17284 bytes
SHA-256: d84018f6a1e54db253b0e6429fb8abddc8d74e2976efde24b89658a9b0820d5f
font_01_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 11460 bytes
SHA-256: 81029311d84ca96d3f8ee53da1e0e5642c1df580f0681171d8b3126d02841740
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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