Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd9c1322dd803b4…

MALICIOUS

PDF

74.2 KB Created: 2021-10-05 16:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6605c117ef860c365d2799a4f17de32 SHA-1: c8cc7017ee39fbcbe116e65de3ade23608be4275 SHA-256: 2fd9c1322dd803b494bbee2bd94300f82931ba4cef1f75fe3879fb0919455be4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to files hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://drafthe.ru/uplcv?utm_term=dr+jekyll+and+mr+hyde+pdf+english+oxford PDF link annotation
    • https://fullgame.hu/uploads/files/vezerome.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161584c048c9e9---fizerawi.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/kiwavu.pdfIn PDF document text
    • https://cet.sk/res/file/mabanuzovefetumefam.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/fenokelode.pdfIn PDF document text
    • http://btfa.tw/upload/files/7987381550.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/76811287251.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/93751542395.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/47074831050.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615b29e4dcf69---girasegutazid.pdfIn PDF document text
    • http://hcpcsz.com/upfolder/e/files/20211001194527.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/58538875607.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/pajamo.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210918044516.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/kotezazezuxutolijivukura.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/karuzufewitadegavewut.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/vaxeperilirisolez.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3666d022---powutupikajefonu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045e27b0af---rudow.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/10596557475.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c98b86280---33386554438.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8a297e91c---norinekegomuk.pdfIn PDF document text
    • 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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 17360 bytes
SHA-256: 44b48565d638d8faf5890b5a184aac88ab0dd668c2b93bbd158b9f4220e94074
font_02_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 11284 bytes
SHA-256: 29b55b8b8c842f24d4055c43900c370030a3ba12dab109d7addefd00892d2339

Open this report in the interactive analyzer, or submit your own file for analysis.