Malicious PDF — malware analysis report

Static analysis result for SHA-256 922285e20ece2b25…

MALICIOUS

PDF

69.2 KB Created: 2021-06-14 23:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c7cf37d757d3c6cf807859a8178c9ef7 SHA-1: d9bdf4ab943e45d2b584f5d36f398bde124b8ee3 SHA-256: 922285e20ece2b25f45c3e7a2702f970d59909334947c4410f79fcdae872ed35
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a link farm designed to redirect users to various compromised websites, likely to host malicious payloads or phishing pages. The document body, though heavily obfuscated, suggests a lure related to 'Igcse business studies revision guide pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=igcse+business+studies+revision+guide+pdf PDF link annotation
    • https://bdaudit.ro/userfiles/file/xobawolavipo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c142593f83---82285168604.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/bc1ee9d148202d9e20b37ef56aab9a36/30571243936.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pujixevobekujesila.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3bfdf829a55d3a0523c94514878fb9f1/mumetejelowoxejidikadas.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607284bd097ba---lifibefumavinika.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7f4688b5---zafasaravuvo.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/25572479936.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/59533610985.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160720364e4212---41293185289.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d80b4fdbe86fee89496e5d21c27ff923/baramijorefexugugiloteji.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e307b87e70c09f1ef52c954378ab2a6b/8805622442.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a907165036c---gosawemovaxirekozap.pdfIn PDF document text
    • http://santeh.md/img/files/tikekobedigopurupub.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/70707565952.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 5216 bytes
SHA-256: 46672f6c6223e0f1b6caad50b7e4f2182c80a8b5dd5711515922eeb645e6051c
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10756 bytes
SHA-256: d0db9d4b4b70a9f2f7ef019bdaa3fcd713b4cbee46fdee5025fa7b2c9bae721c