Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4043dc8770c363…

MALICIOUS

PDF

84.2 KB Created: 2021-08-16 22:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23ebd13bfdd68a39c43c42b15f1ff85e SHA-1: 7d203209572192febe59898cb41d118de74e75aa SHA-256: 2d4043dc8770c3639f8dcd104e2a7924188a6ca484c0cb990ea54bde5c07eeda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic firings indicate the file's purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=ingilizce+a1+kelime+kartlar%C4%B1+pdf PDF link annotation
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0acd5a196---43984660896.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/12294931616.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/27391602380.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/5404247816.pdfIn PDF document text
    • https://sambelteri.com/contents//files/35887649466.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/28694914031.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/foziwawa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb64479f6c---88916381320.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/monisewobutipu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d494f8ec---pirem.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/36829167614.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35f5dbc48---5399972170.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/59584206379.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/fae35f27b534371ce2a489cba63feeed/towidiwidufevagizuwap.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/7452322163.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4e18691b---60494954522.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/96963683384.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7e1f3da67591f0b6b77311b5d7b4720a/ramoz.pdfIn PDF document text
    • http://simonide.org/userfiles/file/zijixujajozilowisipeg.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/tezojowunaginiluse.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/95779706935.pdfIn PDF document text
    • http://ippon.lv/uploads/File/52663336991.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/47313854862.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8laiv8k4f2n9pspgu2q1ltcg93/21438087408.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/tovirarutiv.pdfIn PDF document text
    • 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_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 19780 bytes
SHA-256: 7025ab3a622bd5a2999153df987cd0b48a6d9498f6389e1654af374d0a645b50
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 10876 bytes
SHA-256: 25ae2e23fcbce5fb1713f7e86d9a92ea8d87ac844398a50b6f6561e84aa18f00
font_02_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1