Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a300c8b767558b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 13:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6925272be6543ac9facbc24dada35d45 SHA-1: 9517170fec4d3939cdba3d920d75410a7b72905c SHA-256: 23a300c8b767558b39d282c27c213d33419c7590019a9ffbf7f33362b2f83daf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate that the document is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b3e8c62d---95116196174.pdf In PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/tozugoxusirabesidigerim.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/tivakilusonodonurex.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f1ca52c3973eff25451b6d8e5810d06b/93878627648.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/zizamerade.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/pitizetaxodefanokik.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f7da20f1d---wusaweduk.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a84783a70a69735e13bfb5a7c75b8dce/59419991242.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/98683222123.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1c423acf493e303835e9c4d5a9132c88/96690737348.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/zewemixuwupate.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bfc1c32b3---nirelubonarisuxa.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fudenapoxepimijisasogu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948391677c3---bajipavuguzasadosaten.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bofagaranokunotuxuxu.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/81062138758.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/dezejarowebejipelutiz.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/23496351038.pdfIn PDF document text
    • http://regmac.net/userfiles/files/25127408556.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bda47dfca---65135562723.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fa70c1eb---jojuzewidifuzeleguf.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/xigijaruxadukepufavu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/80217604006.pdfPDF link annotation
    • http://bienbao.org/uploads/files/vabotuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=losses+in+fiber+optic+cable+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_off0000be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6C 10708 bytes
SHA-256: 3b0c8b02f4b931211ca3e9cc61198740d40bfb1e1c9148cd618f19a844d486fc
font_01_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 15064 bytes
SHA-256: 8636222611a001e31f213bf6da5d50e3f987faca50467439c0748fa4f2b05667