Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ee79fd44765f0a…

MALICIOUS

PDF

230.3 KB Created: 2021-07-04 08:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9a813f08cc30c70aea93f2303687f02 SHA-1: c647ea84c074b063a46bf6f2c9dfc530eb29cc14 SHA-256: 10ee79fd44765f0a47eab6e096a13d5cc56851be62002138701e97250a3ba7d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm activity strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980f3ede4ae---90501848258.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095455f82b04---53209161993.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d942636---jizimelajelivebilefivan.pdf
    • https://muratay.nl/userfiles/file/45990386629.pdf
    • https://cleaner.pl/userfiles/file/bewuretefapowivu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d47398e628d---18685488976.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1f6b7667dfa53b18f01993cc55a00c6f/6036428098.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a3842753---4840693955.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ccbe1233f---liduzebibewojeko.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c71c199f6---lunozubewexa.pdf
    • http://stardentalcare.org/userfiles/file/bulebikeba.pdf
    • http://infrabud.eu/fckpliki/file/58022890003.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e1d0f2ac4---xuwivaxomuzu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8021b9c6---14882966355.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be352814613---rizogazazejomewiluno.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jrsasrtt3ga3huch7bklvsgf5k/zubijasofumotawazawofemav.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c79b6c037---14764853831.pdf
    • http://evolutionchonburi.com/userfiles/files/4112213763.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608766ac54e96---tojisokumugeritifivu.pdf
    • http://quangcaosms.org/media/ftp/file/midojexege.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607201709cc06---gakosupi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sample+nclex+questions+and+answers
    • 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_off00032987.bin
544cb7f354e255754cb21a235eca71d0a01ba4c81fe6aee7fedbd2bec14a803b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32987 11184 bytes
font_01_sfnt_off00034378.bin
f690afb5af1abfa6cbb0e77ecfb2d63dd9054863381c457346aefa478ed035c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34378 18040 bytes
font_02_sfnt_off00037306.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37306 16792 bytes

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