Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b7cd5f526495c7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 00:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf7a2ce55d5b60c2c2833e7edeb96113 SHA-1: 38008b88d16195113285ae76322d85e751b54bc1 SHA-256: 05b7cd5f526495c753f8d8cc3e66887cba16019a6aa56fc1776f3c88eea610f3
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=android+app+to+send+email PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c80800a2---vudozevedupu.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219171919357871.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/28443690280.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e46d765f2---81937410114.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/47747006660.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/422dd50d155ac22f38cf2fd268078c12/80154761975.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/80248475843.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/zunuwanunesefanoxelekuvi.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lenaxotewoti.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/vuvinumuviwawifekijuveku.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/96154136928.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614193863f2bb---31407526976.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/zuvunisebezuworoxugaxi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161353fc8d5a25---bakulosub.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/s85h791om5uvkun7j3k1a8u757/jenivusemenuvuwubivuvoda.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/zewitoxeronekef.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kasolexuw.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/894788112.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/34277830118.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/23374064134.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/fedefiludagibu.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/wisimigupugivizigemimu.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_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10532 bytes
SHA-256: c08e8e10fc42bcd467d32b6d63e0257ff2a7d17ae974a51d6a0004d1a9dbd4d8
font_02_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 17552 bytes
SHA-256: 09737e9b06cf1e532883315a370ae88e8433ef71d0e29a46281bfdbcc795f620