Malicious PDF — malware analysis report

Static analysis result for SHA-256 252ac9e9b3760227…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 18:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da484a05bbb7a6d5e9c0e67d74506b24 SHA-1: 42831c38f8cb4e6e3233b5f0024ceecca4699e63 SHA-256: 252ac9e9b3760227c12d80430c92488d1feae8bf2846ebfae24d89018b984021
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085812fa1ded---48609689208.pdf In PDF document text
    • http://studiospazioambiente.it/userfiles/files/57325830898.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/72423799539.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xenebu.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/20833946410.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/o1f1fp8kvuv3jlp416kuqhog6u/58979020071.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807defb3670---xepuruledizogezaneb.pdfIn PDF document text
    • https://red-adlay.com/upload/files/65137241507.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/pirifek.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fa79d694a---xesivid.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/32714987217.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/23897677860.pdfIn PDF document text
    • http://195exim.com/datas/files/lakujixepo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/mebuj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ead55cd07---mewilomune.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/pujiluvab.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c1d71352b351bb03437bc088c4562729/32361093008.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/32765274686.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132282fecae1---38637341125.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/575aa0bfbt0111snu5hu3bcbn6/bamilapopaboraj.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/kifiguvuvetuseboweribexat.pdfIn PDF document text
    • http://yjccnc.com/upload/files/mikaxamaxafesobupajimusi.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/xixudawifawovemiwuvo.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raporiviwewanowom.pdfIn PDF document text
    • https://blokhol.com/upload/files/98307882008.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//burabenitusat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=politics+and+governance+in+the+uk+pdfPDF 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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 18484 bytes
SHA-256: 727554ccab4b8579cde953f153794b8aa1ce590f03c0e745ea2982aaea53a2db
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11156 bytes
SHA-256: 9824e7c456a7a5a2fb0345e7d082472d1cd956a730153ca3b91a3ce1d1d00356
font_02_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1