Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e00fe7bf9c2d1e…

MALICIOUS

PDF

118.4 KB Created: 2021-06-20 11:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dba47cce34a7c61fe34a4681e19bfb47 SHA-1: 7b30f38bc65bb612c2e0ad1da05a62e83b9f1c64 SHA-256: 23e00fe7bf9c2d1ed2a71793fac1086de8c7a4635155652811e5523c70156461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fallsplat.se/file/99551835917.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8eab342a9cf372deb54af0814c624fb4/supufuxeb.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0a50da309a4b7cc8b33c390211f46db9/79868615186.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b991f03e472---61043759704.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a06efa3139a---gawigotipukajevapapowedug.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3e14c1c4---21278220123.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/96248745859.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j8alf4619t56go3a4d6mhgvl0n/kolobirewajopaxedo.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/49972969705.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c912cdc954496c788922583f2d086938/sipidulodebij.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7713f47c54---25809974358.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/lurexodanavoximexeluja.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16071b00b48718---61758439075.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e44120d47---43747284933.pdfIn PDF document text
    • https://bselink.com/userfiles/file/paxijamodaratuw.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vefol.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/mh12rsshmhhs42ssnhlnme3kc9/86265611319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lost+boy+the+true+story+of+captain+hook+read+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19240 5492 bytes
SHA-256: 4bae27bdaf717aa2efa3e6af59dcaf9967fe9a038f127831f7d663d0f0aa9049
font_01_sfnt_off0001a4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4EC 11604 bytes
SHA-256: 121bb2b53472ae215b5c7563ac4ec607baf2e380a3e6330305d6b8852edeb428