Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64d96c3e016da13…

MALICIOUS

PDF

89.2 KB Created: 2021-07-30 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7750cadb4ae7da40098acd683e0ce861 SHA-1: 30a04c333f32bb337c8af3d4c1a7b60538ffe705 SHA-256: e64d96c3e016da139a13a7901bbe813cd06193a82c20100def3e46dc41789d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41d86665---17497944127.pdf In PDF document text
    • http://slmj8.com/data/userfiles/files/sapom.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cuf74iddsag02j3t4bmpfqi6v2/31336075717.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/27043869335.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b545d153d50---pevujepero.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/43097351035.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/koxasalez.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fd1c6e5b4d29fd9689268e491003f569/tanuwuxukina.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de432de130---gakitanife.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/vabidivonamabiner.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/jujitipejij.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8bb0cb151---14209423974.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/96207781691.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/volunopipemetos.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/vajarokepudetizuz.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lumuzigorok.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d067e2e82416b716d434ad96fe6b1d5c/bepomi.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/86647322131.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/buwogusigurenuletiximufi.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/67386284279.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/92842495228.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/81c37e29ba0b0215b4d257b4a144b9be/lozokepedivuwakalaxaliz.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/40520894908.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mutukizobegepuvadomeper.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aea0a5dd---nurexeril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=problemas+de+matem%C3%A1ticas+3+primaria+multiplicaciones+y+divisionesPDF 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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 18916 bytes
SHA-256: a8646fc29cfee7b55d2aaab7a6aabbef955ff1e6f563ad4570f222a6aa73ba5f
font_01_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 11448 bytes
SHA-256: 7f88300fd449712559ab717fe4b0066befd4770b8afbaa23b13d4dd9df774c04
font_02_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1