Malicious PDF — malware analysis report

Static analysis result for SHA-256 676b7a13a1aa5376…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d59741c3736d432c176e8330b43ccf8a SHA-1: 1578918887ac3ceccdd4053ff2bfd85177965de1 SHA-256: 676b7a13a1aa5376570594505356a6f354a5bb09e98505144bd96e621dcf7eaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or redirection scheme. The document body was unreadable, but the presence of numerous links and the overall structure strongly indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kayamedbursa.com/userfiles/file/15545776571.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1fee8804---sorivubopovejagigawapi.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/53363970542.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49762b8240---44435899237.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0e919c5fe---98183853816.pdfIn PDF document text
    • http://vswet.ru/f/40049878566.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/jokemum.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/negizolupalizem.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fekut.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zefovosemifadasedevas.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8qdg3qob51i5rjr958hs16ad5r/zobikaladijiwipi.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/dezobapa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c011dd93487---36572923454.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/54529552333.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kr5o8kiq3kqe0jj4mst6pj40r1/94683017628.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc140366ed---56357364288.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/12999738395.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bab136ae121035c9e768713c2466de05/tagozudi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q591e3jvth6hm5881thgf3lpgd/sitanukazolofisedefozuj.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/wiradopidelibimekerado.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sanulopabekexokoba.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/cjf6b286fe9mp16hvqr20igjob/ritegabetoxol.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3d525650---99715114098.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/s05hcqeot3ivtmibgnku6usan6/tujozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wgsn+trend+forecast+2021+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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 17816 bytes
SHA-256: 293daeb492cf9df596ebb5017fc7f935aa9a6d1b3b3cb2b46ff9c9bac3378aa4
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 10944 bytes
SHA-256: 9c5b2da2e4ac7e81130ead436002b60ac08ec554801bbbb18bb61fd3af88c476

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