Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6be0e5fbac0ecf4…

MALICIOUS

PDF

103.2 KB Created: 2021-06-16 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab373f0f15fd735605c45c345b715e69 SHA-1: dac8f69c7bb2e9988fbc474cacd5197bff2bc90f SHA-256: b6be0e5fbac0ecf4ef1e11996536170d0a3f48f2d70ca82e0fbab92e38a0dad0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and embedded URLs suggest a lure for users searching for MP3 downloads, likely leading to a phishing or malware download site. The presence of numerous links to compromised CMS upload directories further supports the malicious nature of this document.

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://synerhu.ru/uplcv?utm_term=bulawa+mujhe+yaariyan+mp3+download PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/20215221711593277.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087632bee48a---45024327473.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/9629540488.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b26a2e24---12213757456.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b54d4609---lewosufowis.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b5660cc7c59e9ab841dad94017bad49/xisexanuwijix.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d360c93---towivubetosivoxalosupeje.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828224c3d4---78959020746.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16209509861097.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ikr3odf8pu28j8qqu0tnv2ob0/fatarabarobi.pdfIn PDF document text
    • http://yuha.be/_files/file/nelozinidetefuwifozit.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/49996363656.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/57505203056.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9e749f6b---55837540410.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be24be8a20f633819faf080399e4b7d3/kewasopuk.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/742d261ad773d5e7a55880d603806346/gujoni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D13 5504 bytes
SHA-256: 1c9b31972d060f853c9b884431cf06e81172d0057643645b7925e0e77ce74c88
font_01_sfnt_off00015fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB4 2044 bytes
SHA-256: 7819ef1de3348ad227e302ba7a5900f372fd4440a21f482bbf68fb1bc67eb97d
font_02_sfnt_off00016921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16921 11204 bytes
SHA-256: cd3c6c7c3a658d43cf8b64af84ec6b409520574bf5d4606b8798b6c775f622fe