Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9732e8f0e375b42…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 12:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d9ceb4f899d37e25578a30fc29db3ed SHA-1: ffee45736f1040e6c35eb1b0c38501af1aa33306 SHA-256: f9732e8f0e375b42d4379cf8e5b6bc7a01d28e748111b2a7c0cb9e506368e9e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soenen-pneus.com/upload/file/xiziwekimilekan.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a00a2b07f---87026391196.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/logodidinopotagu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144081ed0aca---25811977146.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/majip.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/85778652779.pdfIn PDF document text
    • http://skupka54.ru/upload/m/81122292395.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79635202462.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b248d89b6---91795309723.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/52991481981.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2dc31cf2b738abbb7f0d3abfbe1bab66/fatifujixuwi.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widotifuvezetapuwadu.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/68530784978.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/78621766396.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/92499733508.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/lagifuneg.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf2b5aabc2---divawem.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/30724799017.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a95d909c---zezivoniwiwumunaxobed.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613398eae7b83---fixom.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/viletinifojalimurasab.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/jubekavipetubotoz.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/kikam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=max+payne+mobile+apk+1.2+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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 10952 bytes
SHA-256: 392017ea3de634cdc20e84d46fd0d05ef7c8b187107ddeeed94a07fdc7c3e69d
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 19820 bytes
SHA-256: f11b51c4de746aa1cf45f0161840cfb0f5ae0ad0e8b4bc11f027cb3e01e1af65
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1