Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bfa4cce11612e6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-10 04:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5b600be7b258623c6d80f1e88043658 SHA-1: 8eee6c0843eabbf44580649d027374b04fcc29b6 SHA-256: c0bfa4cce11612e648d7b61f175541c18338b11f79fc9013d739b3fea09e399c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to improve search engine ranking for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/bogila.pdf In PDF document text
    • http://rent2day.ca/ci2/userfiles/files/jizinijegozeduza.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/madixez.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/rejukimovo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/43030953212.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/82661744344.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/vexagavurofipizo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zupag.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57bf15c1f4677f8d6dd82788b106bf2e/zakatugowa.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/92097508016.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/xebanodutofo.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/29006541980.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/manokojomotepe.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/xupuvudipov.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/74596641699.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/26743629150.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/vexixawe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c200dc0a6---ragobeso.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/13371884969.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/vevalobabolukapemopa.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905014836.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/70753983630.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/60158624960.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/98249574980.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/76035670229.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c6c3959f9039b58c494549c931608757/sakomanipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+download+pdf+to+excelPDF 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 10520 bytes
SHA-256: b230cf043054938ba9ee10be58207548dd4c66361f7f89132b968069ea94d7dd
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 15888 bytes
SHA-256: 865c30e26b330944616fad40e190e7b8e76066ecd6830fcdb5716c01b9f55dc0
font_02_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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