Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1b9f767d881124…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 04:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c36d05a173377fc4e6b62b8ca57d92d SHA-1: 03887a719c5dea4f48863cc92460a6e72da2d5aa SHA-256: fd1b9f767d8811241ee3b74aecab7f59e65b40a76f7233a6c0ff10e0a4ba8bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=temperance+card+binding+of+isaac PDF link annotation
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/sirivizesesijigi.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/59763751070.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414099a7e70---zekasorezumi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ded3724f9638a3d4e93d0678baeb7d41/29700072259.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/rufojixaladixenoke.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nuvugapubajewogidureseju.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gorogapenikuvunajalol.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/xamomabefikepuwibumuga.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/51381121125.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/dexukuke.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/dokuvipimi.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/31165109736.pdfIn PDF document text
    • https://mmtours.si/uploads/35183670138.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/75487282568.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/55338383997.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211563473499.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6ad96acc4d1562f2132b6b9de1c75579/suxakazamupipiletutuzer.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wijipikelu.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/sobuvopirugalesemixabi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614120dd42740---83210672822.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/11841996789.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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 10920 bytes
SHA-256: 0f09ab072ae6203fac40d7829a6e4d6ac492158b5b0053d82a8eaa9137e958eb
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 18080 bytes
SHA-256: ffec0dd3d79eda9a0e4078bc47d6f0d58de0db20a43c9e28d9fcf36c56f91ab0
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1