Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fcb6769a587bb6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 15:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c03aaee7fbc97502e6b90870b684d64 SHA-1: e041a2646fdd5fc628f27ca21b3338b98ac06609 SHA-256: 65fcb6769a587bb61491f09f6ef7b52bc4d063e2c3f4c7376891cf0bbb1b7f2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and disposable hosting. The URLs suggest a lure related to downloading a VPN, indicating a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://dioceseofniranam.org/userfiles/file/vazuwusosud.pdf In PDF document text
    • http://fese.in/ienupdimages/images/files/pesobevawebixogazopaju.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/56887553297.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/pavotajijifukovumuli.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568e0da9ce---simililaranojolazamuzod.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/24835400951.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/96289021187.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/82457670506.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb07b0ea56---mupewod.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210905_9C6727A6F29A529C.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vesakixogetebejosun.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/vuxukunuxis.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ghtoj9u5s5npn4dclta3mgrkqc/87890640611.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/69799247434.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/68768601383.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/miroraru.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/mexexidalewe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138787eb8a24---52150001329.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/fomovimip.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/12131789491.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/belatefud.pdfIn PDF document text
    • https://cape-electronics.com/media/file/xikurowosezovivezaki.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/75861349465.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/rodokopolawabulejudetexog.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/dobimusaruv.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/36441851569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vpn+free+download+android+mobilePDF 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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 16936 bytes
SHA-256: 6387005072b37af349b3fb0dc431ead95e258415628a7ec547dbb80a140cf381
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10588 bytes
SHA-256: 8acbddbd31f0598d176a62f49aac4b299d872f6ce77dc6ad242824937f360a3c
font_02_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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