Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b527b4c9737caa…

MALICIOUS

PDF

77.0 KB Created: 2021-10-01 13:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39bb6cd622820ff580d625d3d316fe45 SHA-1: fb20cff7dca1a8190f63182eb9e9b78d91d831af SHA-256: 02b527b4c9737caabd09b3bf29b2f1cc44df9168022f644a8d8f4ee7be63a66c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL targets strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=configurar+internet+vivo+no+celular+android PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a256773213b02050d56604c53d8d82b9/57623830519.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/91788156877.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202193199312110.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3021f631---tedaronenesak.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/25afea1715aef4613bf750f1ac04ae18/ratapugapaderusojifuwu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb5256eff---rebimixoba.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/bujupirajilugameziwulujop.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/74430329315.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/kiburasu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/70471545935.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/95943394458.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/24963264393.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/30342287672.pdfIn PDF document text
    • http://remobudostol.pl/pliki/kidudufixo.pdfIn PDF document text
    • http://jngf.cn/files/file/vuxabepad.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/60056439215.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mepojifa.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/rovipakepesefunasegowul.pdfIn PDF document text
    • http://packamate.com/userfiles/figabebisefi.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/nidubetul.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/4765272582.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/wonagirogapisepevimiw.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139988bb7a78---zizozebal.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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 19272 bytes
SHA-256: a8b4b2e1a105c52179c3cfa60c0532916ec5f36826a0d17b04fe1a36ecdffd61
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10680 bytes
SHA-256: 23c8c8541a4df84e7f631765ebb42afbf8f45dbeb2f3000c0900704f97c614ad
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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