Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6a41c94c6f54cc…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 06:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1e095262501cd466b1b24126bb5050d SHA-1: 1e7be1c0d34a3602edc3e6510660ea90deec848d SHA-256: 5a6a41c94c6f54ccb225816c29c8e5a0193b4a306332560fb35d7ce9eec9550f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wienbildarchiv.com/upload_files/files/ripekumukanena.pdf In PDF document text
    • https://weeb.nu/userfiles/file/40449907620.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/rotul.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kl7jt923d595db8upfm27s2bd0/37486893499.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b2fdd0e7---89347615081.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5ad3b529c6fbf7ab4648729b0fb119ac/fevapudefu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fajamuvoxofagisa.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vadamofaxaparu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609102c51e149---64938787810.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c969b19e09450589b750d7a68ddccd41/gixadorowogewi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/13e9bc8263da8a2b0da9b6b58284508c/zolosadefobigipolosu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/17466518203.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/rapobotagixubemawefip.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6c7426e0c3d8d7209e6895617a8184cf/99936725709.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/96064654365.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c061cb296---32917970204.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/2625780480.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/8816103624.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/72272650145.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34221599342.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/m80oqb0vepkjqkd07o0hlpkr0j/2548388058.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/72150681959.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/18a7619da4c2331262d8bd08135e57fd/12706763172.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb961b365---wabufak.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/43942417247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=never+to+late+tabPDF 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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 19356 bytes
SHA-256: 623157e9036d93c84b40f226d7aac0737259971f32164fd3c0f55619f2598e0b
font_01_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 9920 bytes
SHA-256: 9aacf2aecd4cab800cd141eaa8b4c9fedb0d5db350f16a00c7b737595090bd9c