Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf47091b62a4adf…

MALICIOUS

PDF

284.7 KB Created: 2021-06-23 01:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bc4d79a76099726ab3ef2e70453332ff SHA-1: f1900a22cdd1c26067a4ccc353a32143df863450 SHA-256: bcf47091b62a4adfa64edb9eb0318415b415ca5116cea6dbc7cf565183a1ff22
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document presents itself as a police recruitment form, a common lure for phishing or malware distribution. It contains multiple links to external PDFs hosted on compromised websites, suggesting it's part of a chain designed to deliver a payload. The presence of a download button lure and callback phishing elements further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/gjoqae7ktk0ua488qvuahjcom9/31854338034.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e0afc655e936b448a36c61e1e106b4f4/77724157621.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f354a901a085e32b436d2e7e183fe7d8/85071912497.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/16cadoq07a9tp4pl3mqp16d8g6/fopozoditoxab.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071634d0604c---busakowubamasamusesa.pdfIn PDF document text
    • https://autoparkalbanese.it/file/korupizuge.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/popuvatedok.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a290e7578bb---37684365519.pdfIn PDF document text
    • http://metapolar.hu/tmp/18799104104.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/606204acaeedaa3e84d373d0a67a3212/govuluzasegexomete.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/57841251683.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/jadinoxuwuwor.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3cb00811---36698739358.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ad5caf76---buzejudiwikug.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a849ef68298---sojozuramesolukarapugi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c862fd12---61678079190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=police+recruitment+form+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://scripts.sil.org/OFLIn 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_off000414ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x414ED 4912 bytes
SHA-256: ebe5ab26f672039d9755989e1d5095b890f5865016e97aab9279f8319f1b48f7
font_01_sfnt_off0004258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4258F 11808 bytes
SHA-256: 97173924e5cf7993d5dd4d5bf5f4ba5dea3b5197cbcbe202f92a72d1cc4950a1
font_02_sfnt_off00044e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44E03 16240 bytes
SHA-256: bd35cab902120919a56957e266c2758093275a85784671c2bd708a6e39e00fe5

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