Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba7ba080b2fd9a…

MALICIOUS

PDF

91.5 KB Created: 2021-07-02 18:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc9de1422ea764710248fab1ccb1d31c SHA-1: 603d1b2dc2665642ef7eb6ab298209d4a2e70b3a SHA-256: b7ba7ba080b2fd9a5c0b1175790aadf3854ad985abcace5597a5912db966a381
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document employs a social-engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. Multiple embedded URLs point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • 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.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ab64c8c3---84506167651.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/25f8n9ot9v6a4fuh3ms6fhrk0g/80011003505.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606f0ea540fde---wiburekuxojurikefo.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3e7cfe81416732d4d544f1a688dc31de/jodajifezolitefi.pdf
    • https://tempatpasang.com/contents//files/kazemozupuz.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/50020927568.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f10b393c---sodagovogoj.pdf
    • http://www.tekkoo.net/images/library/File/mokumuz.pdf
    • http://htygroup.com/upload/files/xovawuxijowupom.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1b6f1ba2---64729865717.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3c5bf20d3ac7493a3c882805b068e69d/36459444021.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cb72a2d3---77566997746.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074082d8c35d---23754844947.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/324d8481ffeb0add7572acd903fdacdd/lorejojujavezawowalod.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4d5a9ahpgf931ql8obtorj7uro/sutupekev.pdf
    • https://immobilgold.com/file/62208701110.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6019f8f603a0379a4ea262e87f3e64e5/zawanozizesuxo.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/91c18d82a341d7d142e03f9ac1923000/soralaraza.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fisogolikobonamis.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28b4c4f7a---zumifefinakerusepuvopodi.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7e636001---tozesuwokujado.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8f63124a---vapomibadawinibelodowot.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ce17e9ba6---vekojofagewake.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/giwofuvatu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=d+and+d+fly
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001061f.bin
5663b7b94c2eab2872f99d75added504fe52135d96bbab76851e8f81d69f25c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 17312 bytes
font_01_sfnt_off000133c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 16792 bytes
font_02_sfnt_off00014bd7.bin
1819fec2ff408cb5c647fbdb0a1b03c626d2c69b50c566f6393e353d5736a517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 9752 bytes

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