Malicious PDF — malware analysis report

Static analysis result for SHA-256 f315c861d2390bd4…

MALICIOUS

PDF

85.7 KB Created: 2021-08-18 15:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 663c9ddf9b81377b1c00cd1dc9e5e5c2 SHA-1: c35d4473081458a50f73577dcc2ef8d479c709be SHA-256: f315c861d2390bd40135405217ed87f34764ca78ece3e7d4fe46259fdf4bf720
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11a873e5c---4241153029.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d61712884afe20ff5525296bbfc7587/99053115521.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/89072398330.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/mowir.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jln2c50bk6d31g53nf89o2pjur/57164745498.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/372f974168fe1c6027be5a3adb97c976/tusoma.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/12584664288.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/38359198684.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/66921169695.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0de3b1926---73588114863.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/30834590050.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tdpi1qvedc4mfbohqnn9l91kvt/44577370399.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f4cbb800d---rober.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e480216db13---12675236960.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210814054705_1488433172.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/92792767033.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04b92ec7df---nubugovikatu.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/48611844240.pdfIn PDF document text
    • http://12shio5.com/contents//files/wanuzerowafizo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfd2559f9b---kuwapilo.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/fagojaxu.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/29239182318.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zowezosanojibawabimege.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/37153204007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+con+radicales+3+eso+resueltosPDF 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_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10748 bytes
SHA-256: 7a9095f354bae588b618d16a9c91c2996234ab1aacdf879771b8e962353adfba
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 17620 bytes
SHA-256: 74d7a2c39a3b37fe51274a6607ea9c0671f690880d36327f464bd069c51df6af

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