Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a07f1c28c08b64…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 08:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c8faccd1720f8542f3922b6c1a5710f SHA-1: 6372aae4eef84fbe69876c98810cde9cdd85ddf2 SHA-256: e7a07f1c28c08b64f05cf211aa7376fb8ee1b674db64e675af79d2c02bdf2855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely to lure victims into downloading further malicious content or visiting phishing sites. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=download+minecraft+pocket+edition+versi+baru PDF link annotation
    • http://vinhosnorte.com/images/files/3973050302.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/jujudunegafuzexamefowo.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/5947256350.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/885859149.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee47cbaae---julimovivupepevuna.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hksnbg77di0ad49jt57nnuug8s/54419063344.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464b33c096---gaveralur.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mudofakat.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/josuwaruzupijokotudusuze.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210911093728.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tapazudebu.pdfIn PDF document text
    • http://gibisch.biz/files/files/zazalivaduwusigagu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/26965718547.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/84817901944.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/85521041049.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16135514e35011---nokikutazegawage.pdfIn PDF document text
    • https://digireg.pl/upload/57437779658.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/xofomujepabek.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/7341671638.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/dusuberasisutunurarabi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/guteludesifoji.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/87624096357.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.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_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 11268 bytes
SHA-256: 7a8c52af87055ab12b08b85994b71ef9d1951def7decca5a87eb2b98d816f1ba
font_01_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 19932 bytes
SHA-256: 55585f826cdefad48edcff16067a33a59e3af6cf8497ab68722aec19d7a9c4a4
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1