Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5e4d77f0540c9b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 23:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f680374934386d9eac69a2486ee6a3cb SHA-1: 375b06a989968e3b68e09d969e13bbff7b7e5117 SHA-256: bf5e4d77f0540c9b9c51dd31d5d61ba2fefa0aef3b8b137aa8bd4e0f3514dcf5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a broader pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45849138119.pdf In PDF document text
    • https://perfecthospitals.com/FCKeditor/file/27510913087.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bivazobebuxagujutozesodo.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/45362162313.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fakizulemaf.pdfIn PDF document text
    • https://amgaa.org/temp/files/20157636825.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/besojitemibadizegesa.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/12745997270.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/85285050237.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/xopinowefexazexojoj.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gomudilexurezimufebexat.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_211127.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/44468991094.pdfIn PDF document text
    • http://aromata.ru/upload/files/bijolibizanasupepixosev.pdfIn PDF document text
    • http://ternovykh.ru/content/file/fuxukota.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210911170927.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa6dad682---39818412969.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/95075454486.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911225422598642.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6e3a1275953d4d20c0a9fc74222a720b/47453961935.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_085051.pdfIn PDF document text
    • http://poorclarescork.ie/images/rawubawumugomozagubuzago.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a50a15c1---99241273012.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433fdf2ca9a---3703436441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tubemate+download+appPDF 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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10480 bytes
SHA-256: 7b040f904e3c1e2844c89f258de30d8b52fffe4ce77f7c819ddf23b89ccf4c95
font_02_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 17268 bytes
SHA-256: a2a1aa3a44ea28bf6f385ec47e60a65e9f59fd7fd74f180f11c9c14b0f48ef9d