Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62ddb5bf299b540…

MALICIOUS

PDF

83.9 KB Created: 2021-08-22 04:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66b79d5e79cf6d72a664063bfe9740c7 SHA-1: aa966bcf77293f1caeecc5fba4f7ba68bc2f9cc6 SHA-256: f62ddb5bf299b5407086a63bd28f1ca9e8553d489cc093f8a38d83554d96d3c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. This suggests the document is designed to act as a lure, potentially redirecting users to phishing sites or malware downloaders. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://waelfawzy.com/userfiles/file/ In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nifugitenibopuz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c955336a82---45859604610.pdfIn PDF document text
    • https://eternalbliss.net/file/guforelidu.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/39184550519.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/13053911369.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d4143484---58517158338.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/60508294078.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/85952268029.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/so16fcg7hose4lb1cshh4psdu5/nifotogonisedutitesadifuz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce9b7bef0---97056438324.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/47108087037.pdfIn PDF document text
    • https://palet-school.com/files/files/9846855956.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16111a492850ef---tufaroxijokolovi.pdfIn PDF document text
    • http://www.centralperdana.com/file/buxure.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072613432373499.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pomosapiwibubebokosigax.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/43486691948.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e4c30d97693afe89ee627344634b12a4/15634859736.pdfIn PDF document text
    • http://samtekelektrik.com/files/fotufifoxonufen.pdfIn PDF document text
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/28208515897.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/16763009.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b606f9918d---zevuwudejum.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/tufoxesabeko.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/75122670138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=precisamos+falar+sobre+kevin+filme+online+completoPDF 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 18488 bytes
SHA-256: 1aaebfb6f3fa2c1fdadc4bb6564d2569c1d65100a9596bf9308a6abe35a09746
font_02_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 10940 bytes
SHA-256: a6c764d9bfb2673d78ffbad54b53377a83a9949ecb65e96e26da108a3f5a6823