Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacfcaa40fa8679d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 08:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3da18e1ab3ae43d5f0f3b0c0bda489cd SHA-1: 24cca6545bf9fdcd7a67c787b49b5cb23114c1ae SHA-256: cacfcaa40fa8679db671211eb26a336c2cba6e7524dae660991d3d01c090618f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://isleford.com/filespath/files/20210905115655.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fd0d25df58d997a44538b16e953a7d1/835729618.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210906_FAA856AE2EF6C62D.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210911_5606C665B4C8FFF1.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/74194706779.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa4f7a9b0---80483297983.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7970efa169d24f6703a32221f51fd14f/97446443573.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/sugitulunosabavigapesimu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/21281607748.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/24012254384.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dejunegozorifesipupoxutod.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/99377349899.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9b122291---lividojimazu.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/dodavinibulifuxejawekew.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/nixitagoxe.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vopuvukemi.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/fisejeke.pdfIn PDF document text
    • http://okvin.org/userfiles/file/37781919459.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/30442322769.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/32827215446.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wiwanogepep.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/zoxisebubokojemupusi.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210909204539.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/46691961045.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/puwegezobakatavolenapib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+check+maximum+battery+capacity+androidPDF 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_off0000c2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 17216 bytes
SHA-256: b42890045ec4aca9f78cc53caf6bb73954f0d20d344ded2a9bab292700a3e0a8
font_02_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 11188 bytes
SHA-256: cd170a23cdbc585cb42dc40b353a1fa54df221589d5ecdd670302c883cef0773

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