Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f705cb8197af76…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 14:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b0b08b5be492485edf1b862207180bc SHA-1: 37a8053498cccd342639fddad5e146d06ce832ea SHA-256: a4f705cb8197af7617f6efa58aaeecf9317070f08a3c82b6b0a122ab2ca079c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely serves to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://inwebjor.ru/uplcv?utm_term=write+file+to+internal+storage+android PDF link annotation
    • https://dafelia.com/files/romodopavume.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/jizomuruwepo.pdfIn PDF document text
    • https://alpinashop.bg/files/87786672054.pdfIn PDF document text
    • http://bamor.org/userfiles/file/wikopesinuvebuwugu.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/39498430695.pdfIn PDF document text
    • https://linker.tw/files/wewuvulumovekiw.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613612dbda407---77431453691.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5c8e77b5---21105988653.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4fb8e0a2---pobaxejema.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/96974855625.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/ruxizamula.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/75310305998.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/mokegezomurelodumifare.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/joxemi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/varapemomuperawisugese.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/96207992196.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/gajedaj.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/sorumikerivom.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/bolosirajetukisimuwivaz.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/43853425444.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/74586154716.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/98462754437.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/73025637965.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/vurifik.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/90238392748.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/13890309901.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/tanoweluridaw.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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 10520 bytes
SHA-256: 6a5c11b2bf9c086783c66fd0a9a3488572dac1a9041c1f0c299b458e4023ccf1
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16252 bytes
SHA-256: df756e44406c80ba8fb2d35b8c9089b99ffbef19f0a66ad124928827bdc8d32c

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