Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f36435f4c985c2…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 02:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 87c16b67d74f2499f44a9c54c69bb657 SHA-1: 9d0d01c81f832bc017b7c6f8212f4ae6350f89fb SHA-256: e3f36435f4c985c2ec7dd78d6cd363b10fdc429ea5f34009f911972f1288fdf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=top+10+websites+to+download+books+for+free PDF link annotation
    • http://phuocthuan.vn/images/pic/file/12656995561.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/mefalowamilu.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/55277260383.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210518121656.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/duzarovegeri.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051114304773499.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/fusurekotali.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ed2f3e363692beed59da7cca956d14f/tipifevufuvonajof.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc0ea5984---xekagibixetuxonalubu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/252534cf10a919b96d8b674f6301940c/putafoxapesup.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/up8rj6ujs6l3sj7m9kllp0lkh3/dewurapomojikaromo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/534501ef791da2b1e28072dcef7e22f1/49831821234.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/47597763002.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/zulebutosenefofajopumis.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085803308c2f---93232014002.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kapikuwibesinariz.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6399126cd0a9eb1e884cd15c57d78b90/wejodiw.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/631e3nnldq3eucdlb3flf10ma1/72748451560.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/833a4d8ea0c86ea561ce4f81c0ee7fda/28320571457.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/zezogurukigopojuzijema.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/jexilujamaviwexab.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/ralid.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/16823827723.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/iu1c0as6bra72mfirq3b29al14/66433896505.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/sabezuzupaxosak.pdfIn PDF document text
    • 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 18152 bytes
SHA-256: 2f9a81f1d76d7d25e14c20a01265db56be959850f5b291fcc734d6644b4d74de
font_01_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 10948 bytes
SHA-256: 40702f6eda67634bf0d3ee25fc6baa3cfc373e84adefe8543690b77866566401
font_02_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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