Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5c13042c41c634…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 15:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 456b8595e513e38eed6e7cd344e45edb SHA-1: 26d8a5015195ddd60649cc2077fccccfbcf780db SHA-256: 6b5c13042c41c634926671b85773bd7e1d69878a1df0bea3345aa5ab44f74346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the document is intended to redirect users to potentially harmful external content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=come+craccare+un+app+android
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bafab0b313---kekewizedanisewo.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/budojirugagoj.pdf
    • http://www.pranabkumar.com/fckimages/file/vojerexur.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/95634357839.pdf
    • http://goldcoil.com/uploadfiles/files/jexomotogagutezovatoxepa.pdf
    • http://mega.kz/media/upload/files/33552412667.pdf
    • http://pivotal-technologies.com/userfiles/file/xegapomotorizuxo.pdf
    • http://2222.netsociality.com/upload/files/68837301307.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jasebejopelap.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144e936acc78---65064779009.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/80892364325.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/tokipejabufuxu.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/veselo.pdf
    • https://graveyards-fuj.ae/userfiles/files/jozuvetebefemalafeko.pdf
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/57645275916.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109041206287988.pdf
    • https://polaria.cz/images/file/mapupegov.pdf
    • http://portamarioarchitetto.eu/userfiles/files/4805880484.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/ropukobopojaja.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8f1541f9---95856217111.pdf
    • https://newtop-eg.com/userfiles/file/68646098445.pdf
    • http://hyundaihungthinh.com/uploads/images/files/15369304635.pdf
    • http://chochosanencino.com/uploads/files/farunupodu.pdf
    • http://zjgyuanhong.com/v15/Upload/file/202195122843430.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e568.bin
086374a5025ff16341fca48f72e7886a9c64f9d8d3e4161fe00dec57051c9c46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 10496 bytes
font_01_sfnt_off0000fd28.bin
010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 18056 bytes
font_02_sfnt_off00012c07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16792 bytes