Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdff6504211df4c7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 04:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2d3323cd5443ea88096ff064e9a5722 SHA-1: 6e219437b3bfdf60828aa665640b3440ac432ac4 SHA-256: fdff6504211df4c72db0ababcae2903ac4081a4e5201481aae57ce5f8cb03d10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS instances. The embedded JavaScript likely facilitates the redirection or download of additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://smidgel.ru/uplcv?utm_term=temple+run+4j PDF link annotation
    • https://hr-serdahel.hu/images/file/simekulofovibiv.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/99023676624.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/1324722594.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/75105001250.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/91971712698.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/74164686202.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/juduwalerijugaw.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/76871836507.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/parefuvibitademepo.pdfIn PDF document text
    • https://hse.tw/upload/file/rozeke.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/38800685837.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jowogofodukejifibi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351417a0f8c---sepurixazirizinukoviko.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/30002280347.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901075705_904477154.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/71c1479f39e4b6bab372991bd74b1fff/86283467838.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/53051604869.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210905175739.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/febonipavi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ede668886---tonugusol.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/12386411128.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/junugivavasaka.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/66862891469.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/17016598763.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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 16576 bytes
SHA-256: af7957a961689889060b11f8e9427d21de97bb8c8f1f543c741432d81fb95790
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 10044 bytes
SHA-256: bee04020557722f7602021a896fefcb49782118ac857815c618f6aae032e2d9c

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