Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc00b8555809eeb5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-24 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 609e3f8a8f52302454440d710cd9ad0e SHA-1: 8bf03f09726c474463667ee4ecddf89051e40dc7 SHA-256: fc00b8555809eeb569eb87d0c38c4007f401adf8e4d85a8a6370692df0b10977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary attack pattern involves luring users to potentially malicious or phishing sites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=face+according+hairstyle PDF link annotation
    • https://soechi.net/userfiles/file/jovobubunubav.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/rovafodijudozalelamurefow.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/730129612.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57669793027.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gifenirib.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/24947831088.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/banutelagepona.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/33629980691.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147ba38c9a42---zesabuzi.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/supatogerevopi.pdfIn PDF document text
    • https://robodom.si/files_vsebine/77021070795.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/62893530857.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/vanedivaxofiji.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632329210.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/55630048568.pdfIn PDF document text
    • http://wuchem.com/upload/files/zokedesezawow.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e81b4d60---49464721692.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/66867060939.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/83373331913.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/filevosidemelewopumir.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumevul.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d2087e300da1726ad01a2a33e6642cd9/pakalas.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/10080066796.pdfIn PDF document text
    • https://atlantidegattico.it/file/59757741208.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_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 10740 bytes
SHA-256: ba297ee64c335b9ac3003789ad2d9d0eadd8e780c74154f4c3066a3c683a78fc
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 18060 bytes
SHA-256: 0f9362b5ec6268ca3da7b336306258e4ea78f49c69756d60d6afa6fb34f26c63
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1