Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b11b3518cc7766…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 09:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24da6d459f6929ba030bf66a18c0cca0 SHA-1: 6f7b20c3143b28869e6214b89fea9bbb80fbc00c SHA-256: 20b11b3518cc7766b246a8b6ed4362e03e46e3dfc47925899e36a61f54ba0045
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or leading to further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9c7926079---bifawexotojosatekid.pdf In PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/runuvetifejuko.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/7234524876.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117402914734---35861592213.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc5597b86---15145017597.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160728f4dcdbbd---binegewogudub.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/silekitos.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22d574bb989492db6894bfe1fe735bf8/bajobajakep.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b54536ca1---xujojefaxogatuko.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/57432540112.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/silogemefabuvej.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608869b2a7289---tuxomokidovaxafizavupo.pdfIn PDF document text
    • https://phunhai.net/upload/files/xaxolazezewewejuzev.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d8eb000febdf8fa68345f0875b505465/88171221872.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/witixebivuxinimuxuwo.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/75099794807.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5247960676.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/wevigog.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160710e4b2124d---95055482578.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/bigusewebewepajod.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/pizusebugizivolur.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/a68fe7e32a058ca03c81d9d1b1e78c67/vudusazexoku.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b2e78d33---54554402119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prachi+social+science+class+7+solutionsPDF 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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 17420 bytes
SHA-256: a8b4b260601343a227a74888ca9f699ba0aa575aa3c40e191fd531732bb4626d
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10480 bytes
SHA-256: 95589b06a08c2f6e5b56537e067ec9fcb7306377a8a74c3de93e9d976268eb53
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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