Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8d0a7cd6f1b530…

MALICIOUS

PDF

82.3 KB Created: 2021-08-31 14:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b4fcee5424351839c46d68a30793ccc4 SHA-1: fc4aba49cdf03650918741cec60f9ba74f5a9784 SHA-256: 4b8d0a7cd6f1b5308ad0e5e3ae40b168a38512bdc8b291fb061fd72fce8df307
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or phish users. The embedded URLs and link farm structure strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093d21621e86---36519621438.pdf In PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/munilazimuzezerejamifila.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fodujabiwerij.pdfIn PDF document text
    • http://cke.hk/userfiles/wafevokagudigudanore.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210830130944_akyrw1.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9a1acdb57---ligapu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4e08cbb3b41e2e0e55cd2d91c7752ec3/zirezam.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/isf1dfr741a1sujbavitmu2rk0/35597049914.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gugeda.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kixizedafuxosunegipuz.pdfIn PDF document text
    • https://hse.tw/upload/file/vazesureboji.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4ae6c1ca---lugafosim.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/13210028034.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/03267b8ccda0be29e3b161d2e7ebcf5e/16005296444.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/butiforizasovetu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e91c8013---26353789035.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/redumopimonajojo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d414390fa---88714472504.pdfIn PDF document text
    • https://alutat.com/data/file/18142951919.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ceb901d4---32762426862.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/89260924300.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/50428064797.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/61724446420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=poorly+differentiated+squamous+cell+carcinomaPDF 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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 16292 bytes
SHA-256: 186ca447168bc98fcb3baea725a5b4a41beb696e447e9443d4aff8eda8930bdd
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 10996 bytes
SHA-256: 10bdc3e24ab9fceeef6c41b45b1a56f4358f8cadc954d2f247a9e1bed9f47d14
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.