Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82821618ea80f37…

MALICIOUS

PDF

96.0 KB Created: 2021-06-13 22:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ddd413d451dac06a072625e040d589db SHA-1: feaeca045eefea48d00c93d11419fe3061e4bca3 SHA-256: b82821618ea80f37d5afa0d63b47bc86f1b9ddd91833e78f8924fa782a927058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=download free afro instrumental' in one URL indicates a lure to entice downloads. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=download+free+afro+instrumental PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9678f2789---gefubuwo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dasalo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gl2lh7e1rkvtvf10adk3kiov69/xoputamujugutarexamazo.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0d59d1c886616b029f29f59183c6d3fd/terojopirebor.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bd895d3fae04b0ebfab049c7da1d9b6f/xawivuf.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b867651b135---84923236179.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858971d6803---89656697255.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7a5102add3457e47fa111679dc64ed12/tovolimetajelexemapox.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb51bacb7426e20db036316c1fdb0e37/pidobijororepegetesuz.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/78814514390.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/am5aq9madjueok6689d75qdsm4/faxexif.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/fiwopevifop.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/godixisutuvumexuronaro.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/semozafopijulamuriropax.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/292425146930fbf14e52216d83f70728/rekezobik.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/u3qtdb68pj8smhtgcm8dh3ho4k/36319508463.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kqrrv0p18snjfbdtqi6ivtvs75/kovefejazovovuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 5144 bytes
SHA-256: a2e2f332d64f2041c312e43bd7c8a04a68dbcce41b8b5fffa556bfdb3dc76533
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 16028 bytes
SHA-256: 8c94a4bd6c7e54b648d963a0493aa75c3f17aabe42f2c809006ac2de8a82c81c
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 12148 bytes
SHA-256: 4da77a1d605460f17c008f30eae24df67f5c5426ad83a6474ba23e0924134fd8
font_03_sfnt_off00015c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C03 16488 bytes
SHA-256: 68422c5bb435e28c6f41515f7ca256ae389a44828fc1027a7adc3ad74f9c88e1

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