Malicious PDF — malware analysis report

Static analysis result for SHA-256 684098beb11e22d8…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 00:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a66afbfa35ae4bfa89b275ba4e87ff SHA-1: 844133a91e0740b32bcd78a64472e0c17cb8d105 SHA-256: 684098beb11e22d895efd87ccdd4cb9cf9720e3a5d74cc3b841f1eaedd116ea1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the ultimate destination and spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0988784d6c19d47ff3d013b3b04aab49/79871149805.pdf
    • https://kurek-rowery.pl/user_pict/file/92827949728.pdf
    • http://brenno-tojestto.pl/userfiles/file/gakeguju.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78486382939.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b784a5ef63---60871508708.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/g1dpbgpa4qvj884an0f2f5l39s/65477476688.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b88b2fe335372f09c9a20a6f16785ddb/karezitito.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/mhum0oavabbtsrh6bg0j3b4694/21293495118.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9d4aa5fb87e7befad60c419e1519fc32/wowet.pdf
    • https://mgogs.com/mgfiles/file/66467079145.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ccf977b6eb217f0f1f6610ddd303c27b/pomagukomaruriboz.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160755b74971b5---kolusaputijuwoxeziliweja.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cd39edfe---82401402730.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/naub9lbmei40d87398eho4tbfh/9814001509.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6af481ea4---joxivogo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896f6aa11d---lerovoketapufis.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cedb449e---60926427233.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54b118f761---30440200700.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/6691d3a898a2cb8f981764a11792632e/94359561404.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2619017bf73709fa9654e05c97f3c6c9/xivikedokekovan.pdf
    • https://restavracia02.com/userfiles/file/43995857418.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=purple+rose+images+hd
    • 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_off0000d593.bin
0ac904debb0cd67fda20a051958dfe2eb7f329d1fe4f61e703b0a3fb9debbdd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 17008 bytes
font_01_sfnt_off00010230.bin
b30a9a529bd6347cb75da4c59f8b72893e3d3ca7b1b15e73d9902edd92c0e0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10740 bytes
font_02_sfnt_off00011a91.bin
6d3c979d175f4fbf2cc0031b60b21f69cdd7ebcc7f70405544b9b6af4e21f1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 16340 bytes
font_03_sfnt_off000130e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes

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