Malicious PDF — malware analysis report

Static analysis result for SHA-256 a372ad110a576db5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 03:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa80491d8f35bade935242a961310dbc SHA-1: 51fb9c75db63fe73878b8391f91cddea71493cc5 SHA-256: a372ad110a576db56885fc3ddc363a501d559b343403e13dc72fdb0248d77cf9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to websites hosted on compromised CMS platforms and disposable domains. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--9w3b11kh5l.com/ckupload/files/33699277205.pdf In PDF document text
    • http://donghotam.com/luutru/files/76694692269.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/jukujiwoxesuwurovizebe.pdfIn PDF document text
    • http://espwireless.net/uploads/file/35821749116.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/81340728903.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gagivamamax.pdfIn PDF document text
    • http://unsersohn.com/images/file/39874560658.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/10330249525.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109061449219027.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f8bbfe9f6eeff4407755a2e84ec4fb2d/vigaxotuteri.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/284970916.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/17001029304.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210904075358249911byvf0.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/baxubunugazabizetafeva.pdfIn PDF document text
    • https://mediaskills.rs/files/3641617823.pdfIn PDF document text
    • http://rotang.net/userfiles/file/50349143725.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/xomepep.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/68349167950.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/8775118498.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f948104ba4---kotibimonapeped.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c22d370317acbbdb749d9a4556ef104c/firulavegejerudobepalovo.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/81792776316.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zemevuxivele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nested+pie+chartsPDF 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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 10316 bytes
SHA-256: 3c4b22a6ede1da9d7b05c069be974a98d9a993ec16148d7445bcd8b4f95248e0
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 17712 bytes
SHA-256: 9e2b8b9be444ea469a43e19fa771b3c33bf5638266b6366df708894725c8828d
font_02_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1