Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9889395b916a6c…

MALICIOUS

PDF

106.3 KB Created: 2021-07-02 06:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 302475d7d50ad0f5408ccef2b55d2a56 SHA-1: 39a4014fdf60bc7c123bb0e22676b8821ac96c50 SHA-256: 8e9889395b916a6cb84205e37140eab91bc3b296e9a6200a1c6db0ed8cc9f9e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 6

  • 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.
  • 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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f01a4a074970732caae7d2c6ff087cb/41947863046.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f089q0264dplnulfsdm8qnpp64/50294662854.pdf
    • http://kangs78.com/clients/66216/File/mekowigalisobupuxefore.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/xapuzizazimexokasabunita.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448aa80a73---rewariro.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/217a9ada517f7f7045a2f213315c9d47/99123665193.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/df69c3b779022b6bc5a8a66b7f8b0cbf/90189094450.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb63ce301---27058498853.pdf
    • http://casavacanzesanvito.eu/userfiles/files/45408807713.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cded59bb6c70cc3abeb16fec4a3e6e6a/18017969431.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c9243fbe07bf2a9287fc7162495b97a5/9549322109.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8712a7c---28686131462.pdf
    • http://astro2sphere.com/admin/images/file/4165625062.pdf
    • https://aravlicraft.com/cmsCart//upload/file/tipigelubovobof.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885d3de80c---15502115110.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160736993203c9---18296599367.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/256fb1aab935c6ee3fcb22c1c5139c51/zavududoveruxelomelip.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a129c5c4180---31610955694.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6ac5f31d7b8467636eb979f16de4144e/39122457274.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e91sr4m14j4n4m4pp72krcuto0/novozoragapoj.pdf
    • http://phpirateboosters.com/clients/867602/File/24609492869.pdf
    • http://sevimticaret.net/userfiles/file/84621248392.pdf
    • http://iseveranscopy.com/upload/editor/file/judoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chives+hot+girls
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001283a.bin
f494a1ef7ec492c9dbeaa2f6175ecd25906ba02eeecbf1e436f4cb788465115b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 10216 bytes
font_01_sfnt_off00013f55.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 16312 bytes
font_02_sfnt_off0001555c.bin
d74280514c522b4c4c03e37d1e28c0757d63257f02e639eb3db75e6925250305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1555C 17792 bytes
font_03_sfnt_off000183b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183B0 16792 bytes

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