Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c60bb84130f1060…

MALICIOUS

PDF

84.3 KB Created: 2021-08-21 22:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0754cf84fd269ebd858e9c010a273703 SHA-1: ec379c6bc8a28886ff988c732f90a1de55d0f159 SHA-256: 1c60bb84130f1060346f1ad8542cbbd0364b80aa5e7c7a05d53ba6c9f4734b6a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage distribution or phishing campaign. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://laborke.ru/uplcv?utm_term=descargar+the+king+of+fighters+2002+super+magic+plus+para+android+uptodown PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52fa264d3---48273516809.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a56217e8a7c45d92dbf73f63746d609b/sogenewibafilupofezegufi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/7gomt1ujv3phmd25lj9ak2mg2r/65144564681.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/61710052127.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/57479880312.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/vafutupexo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/858177d4a6caca3580ad0ccaaddbcd28/nukivapirokup.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d4e671d604b7c4f6aa6122fd499c35f2/37844205946.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f3lr6hjmruougqud2gf8cb0oj/74516249336.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a125a862597---99055998916.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8e2ca735171b3ed613298e16c53287ec/votuzofikanowagixun.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/42108911959.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/61352190958.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/duvupikajedapuw.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075095d134fd---rozunofedeguvutetelasob.pdfIn PDF document text
    • https://motoralbini.it/files/file/93608169188.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo6bkfucuke23qkr7hjshk0o2g/zetiture.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/berekuzamaxilolobixe.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/83492659609.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f287fda0a1cd2ae1be866ff1e4502ae6/fibilurasavorojirat.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bffb692849---namirejuf.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22351c21c2---17000098561.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/785a6178c094024846e34b25dffa2960/6319252461.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nonakawurosakezu.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 11588 bytes
SHA-256: 3d633dd777ebcfc1eee891a56c0df4bdb9227a71721c3b5f39101590670d9b9b
font_02_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 17368 bytes
SHA-256: 5fb8db7deb8b9e7305fa29aa170c61c610ab17b09f20868f2a73349977f04588

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