Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec753b13d7d0d96a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 14:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f102bf066b6e4aeecbb42dd03777b650 SHA-1: 4b55c39e23fb5f9af14f2c816883fd896f543340 SHA-256: ec753b13d7d0d96a76896b5f5bb0e7afba703d117a1eeac81940570997a2926e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it uses a browser extension/update lure and potentially MFA/credential harvesting, suggesting a phishing or malware delivery attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous external links, some pointing to compromised CMS uploads, reinforces the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demurevi.pdf In PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/xavazosolesukuzodu.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/2588167817.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/33128521809.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/pawofewivowo.pdfIn PDF document text
    • https://topupdana.com/contents/files/85883974838.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kamuzemagiwefet.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/565a032b6bfbc3d01c303a7f14067a53/63069236982.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/8564317022.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/39142115067.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/mepokuba.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/gisenukewagebituwi.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kuzakewanipoz.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/9598420468.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f3b153dc---59245633534.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/kotatoxot.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/lajowabekowimisofu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/56475345901.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/susimorafamor.pdfIn PDF document text
    • http://allycatering.com/userfiles/wepodizujizebuxitozelineg.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d29cf737---80137310795.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/xipetorafozok.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/52747150438.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d7c7f2b9f894f74cb82a862c8510804/xirizijezo.pdfIn PDF document text
    • http://precisao.net/files/files/5014916731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+system+ui+notificationPDF 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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 18372 bytes
SHA-256: 11bada31873352f79eb5d52c3179af7f70ecbe9c693a1dc76648f6ff1c83eef1
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 10808 bytes
SHA-256: 77a014db4a228e6421dc302828f497ecec0b56c97df2c025cf8ab17bf273cbbf

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