Malicious PDF — malware analysis report

Static analysis result for SHA-256 989f71f0ea9f05c9…

MALICIOUS

PDF

74.1 KB Created: 2021-07-22 02:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a954266e9f93e0ed9fc5885a25b3a706 SHA-1: e583d3b723a2180237a49cc83ca3c326470f2c95 SHA-256: 989f71f0ea9f05c91fe3f491d71b76ed16c995953dec850749bb46a70366f2ad
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary goal appears to be directing users to external content, possibly for phishing or SEO manipulation, rather than executing code directly from the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://a-kamen.com/userfiles/file/julipe.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/zimorinumuru.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/14022992852.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/pajixevovi.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/66423728669.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/140a4976e402b9c701b3f4f65f62e355/begiwasapiruvepotutaze.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e167d186b49---junejuvokuvovunijidosewes.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083beb841240---jevazuxegefir.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/sitetujuwinides.pdfIn PDF document text
    • https://tepihtrava.rs//files/81918110197.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/67552202743.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bilizuvezutogana.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96dea56c26---mokaratijeworeka.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608408e7cfba8---gibisinowemo.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/gokajitevekupekanujuja.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/fixefawoxubofitupabesaxe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5cee136d47dde285ce83bf8016d7b183/moreviwuwomelumuzupomuzib.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8943248213---34460218007.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/lomok.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/wasomojo.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/71729997505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=electrical+and+electronic+measurements+and+instrumentation+by+ak+sawhneyPDF 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_off0000bdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16332 bytes
SHA-256: 13260e673f10e3975e35e1142706ff8e75a5f27cd9a5c60fdf0b2a4e6e8c5632
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 11148 bytes
SHA-256: 4ed12dd8f87021ca45ed940c9577ec354e9f44d98e6108420cd053f3a6389606

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