Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f073e91f75c8ef1…

MALICIOUS

PDF

94.6 KB Created: 2021-09-06 05:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56ffb4d8c3d55faf1d90a3e166132778 SHA-1: 0a3aef59289a6860742a49f1f8080c826135254c SHA-256: 5f073e91f75c8ef1359fb6dcb8c705e84559f0b53f26ca769535e4b64ad30899
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised WordPress installations. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser update or extension. This suggests a social engineering attack aimed at credential theft or malware delivery. The embedded JavaScript likely facilitates the execution of malicious code or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ee8v834r7lfe8uk6hnac9d4iga/ripelek.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399e8600be---bedugesililoxiletumomul.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333a271873---fugunusedefepibarajez.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasawidaxufubimaleso.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/givixajiw.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/waxotesugitepagatixivoku.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/73991070829.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0bf86836df18ee0c33bb52fba670756e/fiboposamuka.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/zutuwibamotujuzovaf.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ef0207126b37c6957c613ddf40b5b85e/mosixesosi.pdfIn PDF document text
    • http://profstil.az/userfiles/file/desagibezeriruver.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec76c0ca8---vopurojobajubijo.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/gupofojavikosalef.pdfIn PDF document text
    • http://scantech3d.com/files/gogoro.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/lobekab.pdfIn PDF document text
    • http://vtaky.sk/media/file/82074921853.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jupaxifaxuzifuwaz.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a59c93a84b305f09296ae35f841251b0/ragenutaginetek.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/23436938970.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/35792702264.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/13815256550.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/26619176473.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65983b4d71---36361527795.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/36685194676.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acdca5e1266---wifadisipana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tnpsc+group+2+books+in+tamil+pdf+free+downloadPDF 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_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 18104 bytes
SHA-256: 33530701df4db02fee08b26530d4cab9fefbaa9912897a20a2d201754489ce46
font_01_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 11464 bytes
SHA-256: e1972f94ec22887bca104e5e0c5cb96702791d6e3803302232cb8d4ad59b5384
font_02_sfnt_off00015455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1