Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5b37aed2904199…

MALICIOUS

PDF

73.1 KB Created: 2021-08-27 23:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fca37f382c1cf43642a6bf8f6bc93f49 SHA-1: 7692b4661339af72b906e7f3b7dcc819401152c2 SHA-256: 3a5b37aed29041994d2954ebbf5f8326ce7cc9ef03274f27849ad2957c99ef97
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The primary purpose appears to be directing users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://allytemp.ru/uplcv?utm_term=traditions+and+encounters+a+brief+global+history+pdf PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d7ff8b4d31e61f3cad69a7e31fa505e7/22836996023.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/gerabasinuxipisuwazeroz.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/bb9ceb3172b75117fc6871a81064b888/10074139810.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/90592951300.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab783ce35d9---dedewovibajetujinida.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ec4d2c8ecfc0c001d57787c95bb8bcd1/47274862465.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6246e10317465baec79a909f8f3b52db/solusolo.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/39310837733.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/57794196065.pdfIn PDF document text
    • https://bataretak.com/img/files/file/misikapovakezejar.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/32100608845.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d84580940---novek.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/n2oalf9l142855m8otojiai6e6/87275233725.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1384c1ad2---japirakapugukewoxurutifup.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/foxow.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/50848381109.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/96d89af139d18731138e971000ebba18/49044338228.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bawegupegovofinimikej.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/julidinurazozasow.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/12726707127.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/52171775885.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/lesusonomonubisupumizul.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_off0000babc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 11216 bytes
SHA-256: d149e3fdb1b68d6b764c72dc20a8269a5523baea5315b94941e91583fde42894
font_02_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 15756 bytes
SHA-256: 5dcca81cdd9c7ce74ee44fe9e257d9b49704689bb63af77de0e02c3f87ec3a05

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