Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bcb013b70a396f…

MALICIOUS

PDF

91.8 KB Created: 2021-09-12 13:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9aeed54afc54e85e7730f8d09755e964 SHA-1: 459cab7fdfd792a7600b9c060bd5e645308a9a19 SHA-256: 26bcb013b70a396fb1c3a2a005d31fb9df86a33ef2c7f783aa05c8d60cb89571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://oresteruggiero.com/userfiles/files/bisadibadikiwonesutom.pdf In PDF document text
    • http://celcg.pl/uploaded/file/fifarelawapevi.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/zobajameredefokipape.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/6059845996.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613425494e2c5---61230803924.pdfIn PDF document text
    • http://salt17.com/userfiles/files/gasufinifakojenifeme.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/27708589110.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0ce2d6b150f53c8244a60b820cd420c9/1455712185.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/sogafif.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/pudewukudonu.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/87598935043.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/5668420085.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/fiwokado.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/57794237302.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/nafifejajageb.pdfIn PDF document text
    • https://dm288.rs/slicice/file/lufokedajibakad.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0cb69330b3b882b2987d418f63ca9ff4/34155104531.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/60969231658.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/sivaguxaj.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/65749657640.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/22360920017.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/nopejurogumovagib.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/73018486267.pdfIn PDF document text
    • https://podimercrm.com/img/files/nalegakavedene.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/41809005682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=life+full+movie+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://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_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 17228 bytes
SHA-256: eff58e37b63d358459a061815d4e1ad004a056b7337b4a66282969e94e3ce841
font_01_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 9972 bytes
SHA-256: 2d0b70ad9b95ccd7691a05fb50398afc19670d0bb1db0aa000b13d2b97fc8771
font_02_sfnt_off0001495e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1