Malicious PDF — malware analysis report

Static analysis result for SHA-256 747f2fe7cdb09d5d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 16:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 889e5243570685b205daefb7727aaca9 SHA-1: 09b57be8754ca31cb6d3386c7cff16548bcb0462 SHA-256: 747f2fe7cdb09d5d6060dc03be68f3f2537bb122d26ed8e86c34335b3852dd96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure aligns with techniques used to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://smidgel.ru/uplcv?utm_term=double+digit+word+problems PDF link annotation
    • https://autotronics.vn/userfiles/file/23561080769.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/pefokelalonolofo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/morigusomiwotinu.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/6510707215.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16127718a147fd---mejovuwererix.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9e39385b0f464d5274077d5582a0aef0/27591348991.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c683c496d---91506264797.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f893fce4a6b6f08de393e780aa6330a5/25762193589.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec49d53de2---getuvegajesog.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/geditanutezexewabubutatap.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/92421521778.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/80393578588.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/pexepo.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/45012917112.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/88748802269.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/jidazivun.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b730b7f8---vitinuvatafidopape.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5vg0d3tqqbpb4pngm47cs4pn37/lokomokuriruz.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/vaxisavo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zufexokijatimi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/irdn5pvnh0jfs4llej5klmib3h/jojedezoguxijulivo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/87705694807.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e1ceeb4340d3e85439a891ef2f5be2e1/fimaxiwigekagopufubivam.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/18554034014.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0f5cc59e2c19bef92ee6e3a5249bade1/xoreluvakufidiwawev.pdfIn PDF document text
    • http://htygroup.com/upload/files/39116774417.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_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 10796 bytes
SHA-256: 72d8a8d730a137cbb85e3a79567c7275cbb24f6ab8faac9c38f52532067e91c7
font_02_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16452 bytes
SHA-256: b827bd83907d00508c7d49be09ad83c09a181b48a9fd5d43444bb9996a76ff6d

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