Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54e72c3adb49e5c…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 20:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f71caa71b43c3630c6dcd3a5b135b45 SHA-1: 036c1f3fac3e78d42a3624df57b7cbaf1f52d11e SHA-256: b54e72c3adb49e5c449f2294a255280543c8ced3936164f58a994c6b0756ac17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161360870e27ad---jixutebuv.pdf In PDF document text
    • https://megashina24.ru/files/files/59756554197.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/xizoseju.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/pivavaleduzutukuwotapuse.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/92663831060.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/tejan.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0a49c625cf9494e4ed95ab6adf1cf724/72530901946.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/watuvani.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0d984d774d4e720036af1e1b923abb88/24771298095.pdfIn PDF document text
    • http://gr-chem.com/upload/files/68523977079.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d675bbd6451848646b51c382ce47f047/gerisuwotudetixutaxu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sovonesawunugado.pdfIn PDF document text
    • http://lovesenergy.com/file/dodalixodatekujanu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/bimezulikiji.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wiwixurisafidiwono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+booster+for+android+apkPDF 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_off0000a857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA857 16108 bytes
SHA-256: fd741e0470e7bac6c7e3e4b2083a9216f0cec3a056bac4b1c00e1f94e60e551d
font_01_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 10812 bytes
SHA-256: eec24cece759f2462971f80f37de6e54383e9952c1f3517e1d41e04e27d7e7d5
font_02_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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