Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b047baaf972f6a7…

MALICIOUS

PDF

77.6 KB Created: 2021-06-12 03:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d360a508c9e4609a90ca4a8e958d5ee9 SHA-1: dce6ff558ebe36a6b29a97cdc7d9b6db8a7aad06 SHA-256: 8b047baaf972f6a7baadab92f9f632e6248e5071ad47c1ae9a1239701bb05073
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=sarkar+song+download+hd+audio+mp3', are designed to lure users with search-term-like queries, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=sarkar+song+download+hd+audio+mp3 PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d93a13827dc3183b82cacdee313b4fa6/nefoxu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/400f83e022795946a3fa2998d4ed4332/12320003073.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xumurezetipokogeserebuwi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081628dabd26---40409792274.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/04otom7ftpt2705i9bsajcareu/soxogokuzipedolozi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ec807e18696b5df61090d48a20cf94b2/rifizezidorofu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/wurukepezegamuganilusoto.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a6ba7323ba9393004380539637f20302/lowizevaletusurilob.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/gl8i2g3sh07h24su0j6fegrsnh/71061487962.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315deca311---vijedafazunafoxeme.pdfIn PDF document text
    • http://ibb-online.ru/f/file/33194691418.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f95e1dd20---5622083581.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2f961571---nikaloruvobijutozavef.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8954ae090b2856255d32f632231df9ab/pejimizevelevisozoten.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wirojorezepo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf1bd6b2d---vakijisaxo.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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 5796 bytes
SHA-256: a1f005014d9338faa99d69e66e5698b5c103f7846d5fd9c09ebbe0fa40d55511
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10780 bytes
SHA-256: 2caf2bb82d85ec7e9cd980b18be14f0e36b458fee147656f9e5a364063d137b1