Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55225236dc71682…

MALICIOUS

PDF

84.1 KB Created: 2021-09-24 09:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f8b637109a593979765cbedfcbbc2e9 SHA-1: 11464768c2c3d6f6a58b43833a4b96bfd61575e6 SHA-256: f55225236dc7168299120efa000cb136c2d459b908c018c3f681677ee7780bb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://royalgoodviewresort.com/Uploads/file/66017360819.pdf
    • https://nycsmindia.org/ckfinder/userfiles/files/73022006728.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d93b4b50282974c98c4e4012f2208f2e/51099480842.pdf
    • https://intrigantka.ru/images/userfiles/file/gewidopalarekulabomule.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6ne4iscunt39evl7jh7vtuqg89/zefabotikavobosa.pdf
    • http://104408017.linker.tw/files/39736967118.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2534b947b---31642872902.pdf
    • https://nusantarabet4d1.com/contents/files/wijodedinibodere.pdf
    • http://asiadomainstore.com/userfiles/file/kuzukem.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/bezawuvufekomajixije.pdf
    • http://agendatourvietnam.com/hinhanh/file/77351409677.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2fada4550---58222065800.pdf
    • http://busankid.com/webfiles/board/file///61183837591.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/78027929987.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b69c412c---xojonasasaj.pdf
    • http://thewellmanteam.com/userfiles/files/jimuxopopuwefimegojuxipe.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/61316174b5616e75015c454664dbaad5/86481394520.pdf
    • http://automag.pl/userfiles/file/nagisaxatomukatexozus.pdf
    • http://kmconlinecme.com/userfiles/file/83475516850.pdf
    • http://pol2-simf.ru/userfiles/file/40850413857.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/60426249869.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613986ae53da0---mililuniw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lyrically+without+watermark+apk
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05e.bin
885b5675fa8939031e43ca4384dab219bd6a8fcd43841e2abe7abcb0fad4a296
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 19044 bytes
font_01_sfnt_off000111ca.bin
da730b02b47d27bbd75e4b00521874d4f96209acd31e9f672383610a17a36de0
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 10716 bytes
font_02_sfnt_off00012a82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16792 bytes