Malicious PDF — malware analysis report

Static analysis result for SHA-256 461d95e6fdc2157e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 15:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99c9eae1ddc9a9bc1aaba95c3712d18c SHA-1: acc67e38d960f0267f8b85847051ccef3e92085a SHA-256: 461d95e6fdc2157ecd653c4ca6a6eb701e7b78a4e110888d496c2608e17937a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on disposable domains. The embedded URLs suggest a lure, possibly to download further malware or conduct phishing, aligning with the Spearphishing Attachment technique.

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.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef6fe7b40---65796832706.pdf In PDF document text
    • http://rsentco.com/upload/file/19026278504.pdfIn PDF document text
    • http://elskenecologie.nl/files/48392616682.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79ad73182---19497111735.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/puzisunus.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/26148330250.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613032255a663---74206541785.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ecd42587a616d47d86a9e6f142185489/14316930136.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zivosumajax.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/wefakek.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jususu.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/85582383669.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/difuludotixugesisutetel.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/senajitukedeloruxiwirif.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/luvufuwitisuguwuwiv.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/kufaxitadenu.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/79799931878.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/95203831485.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/41825890279.pdfIn PDF document text
    • https://akvaguru.hu/user/file/jovejuwuvag.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7a39e4fb76ff38939a2d19dabb47bdd6/46840024956.pdfIn PDF document text
    • http://zenkatsu.dk/files/pimogedigutosefirajajas.pdfIn PDF document text
    • http://gibisch.biz/files/files/tesadureririxovotunoviru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+quiet+place+2+full+movie+link+freePDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 10980 bytes
SHA-256: f3f40d919da71c2856aabafa15db3593042349d70d70a8ff92ef6d070ad597c8
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 20532 bytes
SHA-256: 69acbf0f1bcdc78dd4d5a7463cdf2121a9f49bc62f6b7a7a5cb3c540809491c7
font_02_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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