Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ab5579b73889f1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 00:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6b7fc26a5e8b134f5ab8f6d1385ca14 SHA-1: 110c2cb659050e4ae8db73bcaa04b9eb7b2d0e90 SHA-256: f3ab5579b73889f119516b7d23746de524a0f19893cdb7c4dc0e57b5b6fdc0ee
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning model and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651846d184---2151917590.pdf In PDF document text
    • http://licausi.it/userfiles/files/vabolaw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8a9ff29e59a733b935c1d9f6f9794c6f/43258353989.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/76326582431.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/87627970772.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/51291400549.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/db7796795d17bccb4a36fbd8b18b299f/nulenopewovofadunubidat.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/15745253924.pdfIn PDF document text
    • https://renetravel.ro/images/files/niretowapipexogu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/delewofagupovo.pdfIn PDF document text
    • http://denge.aero/upload/files/64880997698.pdfIn PDF document text
    • https://kiptep.ru/file/3378481542.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nexesula.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/nupenerowofisun.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/82940359615.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/84166659941.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/181455078461334f9eafd46.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/nakitawigepeko.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ea5cb014767834f3f743ca29325021a6/sijudikubo.pdfIn PDF document text
    • http://julianina.dk/upload/file/48261301370.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/difejate.pdfIn PDF document text
    • https://mlspoland.co/files/file/pobikijev.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/25759524604.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/femovabawuzu.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/fomagarikode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=connect+android+to+wifi+printerPDF 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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 10516 bytes
SHA-256: c2a3a5165562b8a30483ed283dba76bccd2dca0aafe135bf41b76da364998976
font_01_sfnt_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 15524 bytes
SHA-256: 11e0ee5e7f0df43cd26f3fcdd330915fe0f831fb4dbec662799e3096df1d693e
font_02_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1