Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2b839d5fbca0ac…

MALICIOUS

PDF

79.4 KB Created: 2021-07-19 14:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c99f2aa44ead49c6a5384a68f714164f SHA-1: 4f7dfbf8cfea3493756ca0fdbfb355ffcbb755d3 SHA-256: ff2b839d5fbca0ac7edbc5f07ccc4aff04624ddad717ba3bb3ecb54c503229c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute further malware or conduct phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/85c614f660621f193e409d41c1829490/javem.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b42976e7---15717922229.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073243f4f71c---60449670698.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/21670270659.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071a90272054---sejiliditesuteni.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abe37f887---21584354988.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/saxapotogagugadon.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db75fcbc1fd---dasutadusugopofokalo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t724i5i7kanthfka66hh005fp3/57964728006.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608226f824359---veroxologam.pdfIn PDF document text
    • http://dhf-china.com/d/files/30625961757.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848e828aea5---68382505323.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/gubuxatubifulegemijexa.pdfIn PDF document text
    • http://samtle.net/ckupload/files/rogazu.pdfIn PDF document text
    • http://imbirimbir.ru/files/juzovutikeku.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/51399654302.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1vfguo9kta1qju7bs6mg55lgee/48022732506.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/nizamamelegutepokenu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/43872972715.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2d8c5279---nezipujenugegesapewepi.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sixima.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sanir.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f066d012401---42000808248.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/85318581488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=word+problems+for+grade+4+fractionsPDF 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_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 17568 bytes
SHA-256: 25ae9ba8690be5013a401e36f50f3ba79f88d74713fadba8fcb2db4745020a31
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 11176 bytes
SHA-256: a6dad277dc3e3cb0b65e14b37ea9bf5c4af5533f5be4ea3b01a2b691534034e4
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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