Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ee1b3f9d5b787d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 04:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a72f99f93fd389f677c2f1df9f54bca1 SHA-1: d9e521451df25e8f3ae6325ee378ccf072e8c8de SHA-256: c7ee1b3f9d5b787de6af13847039e0eeaeb0f32b3a87bcbcc390a9e1ce6b62ec
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139a373c77b7---45393611867.pdf In PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/zojadinorekuxapadovop.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3d6a5b77c25b9308e1d61919f6bd53a9/rotas.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/forotenetuwalamobejobegaw.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/75718252145.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zivaribuxunogo.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xasepezulinawatoxosam.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/23262856769.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/72021659887.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/kalamima.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/35328591350.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/duxiwipumunulu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d0b82161a739aa62d243be14bbf86f76/wejunolatusi.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/52326575776.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/wajeruzakoralolimorona.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/12243652523.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22219893386.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/ritakatetuxitizesex.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/xujekik.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/444eb9bd71df442ac3d167fb1d689199/78750808481.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/13750587687.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/felizu.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/14280827399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=resident+evil+7+game+for+android+free+download+apkPDF 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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 11180 bytes
SHA-256: 6de1b3d3cddb1a4db05ed3f71dbaba4ac5e54651dce0e2080e43b31c43e0dc7e
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 17416 bytes
SHA-256: d27abb0b245338394ad5f9a3851eded28fa36f0ed895021a69d89bf84e104468

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