Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50061a66bd530ec…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 09:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 339e8f3ed60e42afc30557cb09045002 SHA-1: f89af1977c404b26c78d2a0b6699e259b37e0c03 SHA-256: f50061a66bd530ec8753647d3f37413e8d99098b34418fc724de8df586811bec
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The presence of these links and the overall structure strongly indicate a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161365471498b1---22817636532.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebc92edee---14518574835.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xafugafekejasipam.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/juvorororuvotutaxelis.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/23193990703.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/95629971082.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_163618.pdfIn PDF document text
    • http://wdnederland.nl/file/zazobew.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/b75b1r0imi83kn6hbno9mokbg5/kumikagojogomikebisol.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/2694638251.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/78340601627.pdfIn PDF document text
    • http://jsdarvin.com/files/xomezabup.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/wimipew.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wopetaduratuwar.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/xikodemok.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/87997839456.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b9ee204e---nisidozapenas.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/26436324753.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/29979491348.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/7098109743.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///naraxulenujodosonoro.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5274a846e9c93e1f85e2d4ecdc60257a/linilamenobojaf.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/95777224984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=objects+that+begin+with+letter+aPDF 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_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 18384 bytes
SHA-256: cee2790b32183c4ea3152770f73558aa1bf92344e2241008dcf0b6ffdbb6416b
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10768 bytes
SHA-256: d5923472add274db771f7fbb834f43b3e29844960f644826d53f27cb70f721db

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