Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8eab40c9c5eb916…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 00:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58dc880fa03f445d37f4754cea2b0d5c SHA-1: 832bbf320c310bc734a12941cee43d852a7e5647 SHA-256: b8eab40c9c5eb916cbce2ab1991e5af215b118dc2bbab49b4abad79304e832d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier assigned a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=jaden+smith+ft+justin+bieber+never+say+never PDF link annotation
    • https://caribemed.com/userfiles/file/revoxuvasukabasig.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf3fc20a0e3c13211fc555f212a73537/35270751132.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/75708068019.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/20328542335.pdfIn PDF document text
    • https://bloc-immo.com/images/juwotowixu.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/duperokimeda.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/28773352600.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/paridaw.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/32252454588.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/f62c12f06768167d7636f8be8a03a0b1.pdfIn PDF document text
    • http://robbes.nl/media/files/wepuz.pdfIn PDF document text
    • http://apcmagon.com/userfiles/xofalinupetuzowuzupikud.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a3a0f185---71581892873.pdfIn PDF document text
    • https://filetorme.com/upload/files/26949417182.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/96034795002.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc09ea341---badesarozebukojob.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/samupawarulodirotebo.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210903175352.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/1598171133.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/21954030085.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wajidixuvokifijofigu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c4d46594---94609347511.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_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 19024 bytes
SHA-256: 9d4d31a23192cead134ac65eb846797a25b12c76a14bc92ea17532bf51c3d657
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10992 bytes
SHA-256: c3f57a922298a9c14d2845ce6a0887ec07ccb28b610a52a433ca4ca64946f3d9