Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee820ce379a34220…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 15:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0320568c66675d0c6f5c3ff04f40065b SHA-1: 1224ae9b60760ff77b16eed382a5192cb3c5d242 SHA-256: ee820ce379a342200aa81dca2664faed2db852627cb1b560b5465f2f74e45ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute further malicious payloads or phish for user credentials. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://emauto.lv/index/images/up/file/37573640772.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/621acb49b193bb046a65289c34fb7b16/75749158867.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/41003784359.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7266e208f383e705868172602ee7e010/pomikovomab.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/81522820066.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b881896720---57892338331.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/ninarigexaxujum.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/6671031586.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a641309a897---tumunabegib.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091a07d3d9d7---tuguzirozega.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238561bef45---waxomejupaxijakenaxakupo.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/ribunojagidu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160906339dc1a8---78004741064.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nronc9cnsoppkveod4v0nrksav/38127767040.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609134ba1748b---18823683340.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/monibitikun.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/ragulabokofejijupije.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609595ee36d51---11255557645.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tineladojogufewaxafo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c795fc63405---95716184108.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/4465069042.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/90050811504.pdfIn PDF document text
    • https://gilbertems.com/videos/file/88165807635.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/huulf7g8dki9m8um2afekvnr44/99656450912.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/88677964446.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/40235715696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=twilight+download+bookPDF 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 20128 bytes
SHA-256: 593ed1181f906d33e6b35ea563ff1cfd4da90476175c8ef9e614b4cb2f757f0e
font_02_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 10408 bytes
SHA-256: f6d2f56c126bc2e0513c3675272d775cfa6ee0cbbdf44d97bd3ce425d29a97f2

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