Malicious PDF — malware analysis report

Static analysis result for SHA-256 617ca6045ec1f543…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 22:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc3a264a140a2024fbce477f34b42e6f SHA-1: 7d4082b74e09f5f731245954c6a018b22ebd692b SHA-256: 617ca6045ec1f543d7e0f033d52e89ac79f27b36b6f7c84155ca556021c4d978
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to various external PDF files, some hosted on compromised websites. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://k-barrierfree.com/FileData/ckfinder/files/20210911_2C0D7AEBCCE817EB.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613af83ce5bcd---91952484554.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/kosefati.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6692c5ea48b9d682dbe29163549586fd/11826069497.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915153500.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/51039328789.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/16659728750.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/jonitanesiruxorugiwin.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pobopuvamev.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kurixuvuxefa.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/xuxatilurakonotisusifol.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vikexemebuzuzowibisunat.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/29843054510.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hfk4jj8i3eql9974g0o9rh9th0/78626791725.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/83660798942.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/duserilowaj.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/17773395851.pdfIn PDF document text
    • https://aildf.in/userfiles/file/5939590464.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nikakagabawoba.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/tiwiwukikitufuvarefavovux.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e0j186b99angm09et17lqaecmi/topuwapafot.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/24653152670.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/dotas.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f13821a---guvukuriwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=explorer+pro+apk+downloadPDF 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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 18008 bytes
SHA-256: 025a2e40a49c497eefa68fa87802e235283a908df4a9019ca7dd0b29fa93e7d6
font_01_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 10292 bytes
SHA-256: 003644839024368e5eff7b8b0e05165d66c9abfb41bbc8571e6a13a9413c0028
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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