Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cddeab5668562eb…

MALICIOUS

PDF

92.5 KB Created: 2021-08-19 02:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1876c54a8e7a664d6cbb835d0843a2d8 SHA-1: 929715ec08b355998acb971c798dd4e82467df30 SHA-256: 8cddeab5668562eb09331ccbcd73ac3150aa25599e7253dfca040d84f93c526a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a larger attack chain, potentially involving spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/moerqp6td4oim4er8uimsikeoa/kebasemodavasisif.pdf In PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/marivenujudikakomo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4eeb322da---86686573363.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e285442100b---2335968332.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kuboxukikobe.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/8618a218c1ee157916c659687a0fdbe5/35404313879.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd3321b7c---43847413483.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaff29125b---91296246019.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96215975473.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1522a0fd773c465b0bccaf2db4b5f372/75163345077.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/sowazisadigixoxezufudof.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/0412b0259849f7caaeaa04e17eba943b/joduvojarodolo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1bd20289817a3aa7246e99209d5eca4f/81516991445.pdfIn PDF document text
    • http://tcihk.com/userfiles/navevi.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/kedilaniwidedenu.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/80161348153.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c757cf1c2c---zopurozutuf.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/62073341517.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c2615cbe---59447742739.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/rqjb4bg4q2rha5tkbsprdi31k6/28963226308.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de284bc73---dazozadoravud.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/66382309454.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210806220756933940882on5.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210723_0049773B05BF7244.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/69572171869.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fv4n4f0lqch8imqhggfg26t1b2/siteravovokanukabuboku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tableau+training+for+beginners+pptPDF 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_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16936 bytes
SHA-256: a24a84f8833785150365ab0da2ddc9719c8937a15f184587355953182f9ef464
font_01_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 10736 bytes
SHA-256: 22a95db37615c52c99d63a56ef3e072d1fb3d204b07bd2e04318249d3702552c
font_02_sfnt_off00014aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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