Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ac2b68ff2f181e…

MALICIOUS

PDF

92.1 KB Created: 2021-08-30 21:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2194f2fba8feac299303d5f9de21aa9d SHA-1: a8b3d38e2e67f3c2b39b99da71728fa30f40291f SHA-256: 03ac2b68ff2f181e40659e4e1671b26a3a2d2b314ecebfd027a5db518329cd55
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://verkaufs-akademie.com/userfiles/file/77397211840.pdf In PDF document text
    • http://tcihk.com/userfiles/26056153528.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/97453256039.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/lasibimajesovom.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/43171364566.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ac14b03f84a8c36ba58b0ca944c4c143/togesebulog.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071456b32a3a---fitizipoxepufoki.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f7b3bdf2---95422903855.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1541ab47b09d6e43e9b5f3b1c734f391/4773132892.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9731eaee---97692853013.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/92786800968.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607822ef659b5---9579010981.pdfIn PDF document text
    • http://d-innovation.com/upload/files/nipamodizabulumasu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qiv74ojon3n37qhjka2g311ogc/30794245753.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/nepenomifiwofe.pdfIn PDF document text
    • https://path.mn/userfiles/files/5224964923.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/gokosugo.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210705_40497A50D0A891CE.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/guguxudobediko.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/9361952730.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92e5482256---33703006876.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ec128285---dujegigiwogudosud.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d84f5bc7b9---xozopux.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vuparobubewasim.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/48905005118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=photos+with+the+grinch+near+mePDF 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_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 18324 bytes
SHA-256: 70d6f1e9e4b816bbe1a663ec605a6bef382e8b3d4391a80b43e9919926a61739
font_01_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 10720 bytes
SHA-256: 551e95a18b984d7ec9ed43103e5bf7bccd32652489c2694436070e3e7af0a49b