Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93b98922ab1671e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 05:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86e7062edce258424ca69c28ea0deb33 SHA-1: 93999e1af7ca5c5be282f4553473347247fa050d SHA-256: e93b98922ab1671e412b49aece1438b2b953d49490f7fd427b67ccc8fff4c7fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a42577b4d---92838018460.pdf In PDF document text
    • http://finadev-groupe.com/userfiles/file/wejagejorogowi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6eb62da86---wijuvibonuvaxaxu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vewef.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/vejiretiboneluba.pdfIn PDF document text
    • https://anfauglir.com/images/file/73728090037.pdfIn PDF document text
    • https://thehouseproduction.net/file/63522073403.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/27338603970.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142253a4a3c3---63960118451.pdfIn PDF document text
    • https://ms02bet.com/contents/files/67830363269.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/nogajepi.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/72225110608.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/karozi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/85011658545.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/wabewifikobetuzexabawore.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wejopejexukojova.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/linebutijanuxisegekuwu.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/90743610439.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/32893715159.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/40006305596.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/94215350793.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/52954416867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=1m+robux+promo+code+2020PDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/3080655192.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_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 18568 bytes
SHA-256: 60699633ff61cb92caa8c134be1efa1adfefbb228dbe1eb1854c099b467397eb
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 10544 bytes
SHA-256: d259cccbf0caa008bf8db82e2611579a9e58e5fbc8a6ea079af760dc3baa7e11