Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71a52e4598c8943…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 15:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99d76da5c67e84e978f4751ce900dbff SHA-1: d67b773290e984c87ff9d685540470efd12275a8 SHA-256: c71a52e4598c894354d62cf73ba38d4746c0d8d99d9180c9f5993a4b024aacfe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, specifically a fake 'aadhaar update form'. It contains numerous links to potentially compromised websites, suggesting an attempt to host or distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://provia-events.de/pics/fotos/1/file/gatesul.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/304ebd5122228d70eb89c12bf7f5ab07/98553627545.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/35477775322.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/95548812486.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7btdij2j56lacbfd1qk4p6po18/ravogafiwolejem.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/57110017469.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4d5c44446ddd82843f1815858a61f056/650319553.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/cf90nbfjgoama2kbvnnknumodj/rivorixivelapifi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37340bd156---53387647444.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/simoxeleposazaxa.pdfIn PDF document text
    • https://egca.fr/userfiles/file/39048052127.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2d8673f6---namomuwosomesizixadigun.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xunuluxijexogenuxixut.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735bd604cc9---sorune.pdfIn PDF document text
    • http://www.moyekolodin.com/files/55435744740.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/48d76e2689f295fbdae22b28c70a0ac6/pulukaxutev.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba08176b0c---gotesufekawe.pdfIn PDF document text
    • http://vce34.ru/attachments/file/semaminewuweman.pdfIn PDF document text
    • http://billsky.ee/files/file/risola.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/godijotaludavo.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/repufevajupolin.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/zobalu.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/1430217968.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d37f925dab30fb9eff2826173dcee075/rinixerobegololutafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aadhaar+update+form+online+pdfPDF 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_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 10676 bytes
SHA-256: c21709c839069b3c752b2115ee85c3fb6a297a7880c90f3ed14303a9764dd6e8
font_01_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 17124 bytes
SHA-256: 55549ac1ab0f0c11699d0867337adc350a8c05895574713075f4fd33ce65b7ef

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