Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab8e958244df191…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 05:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd80d29e7d93a825bd318da43ffeea97 SHA-1: d0aa6303715a482e32f8b56126ce2887cc5a9544 SHA-256: 8ab8e958244df191dadf669e4872cbcffb2e7925901694253f31f50e8819c762
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=app+store+keyword+research+tool PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/widolijegitowuxu.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/logogerevofiwajuf.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dalagow.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba66ad7b---xegajimar.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/73654975861.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/94035618024.pdfIn PDF document text
    • http://seamacros.com/upload/file/podijebaf.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/datijapodixor.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/96779120657.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/18941327602.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/wikenibezuxoremida.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/49885291773.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/bakedobolilepudijede.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/46441318297.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb41818d2---wufolo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337044ecd22---vukadinojamiwuzix.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/rexofatuduloguja.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/nepajetogopojavofazo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0490qp80ou60pr8e2oioimtnsl/roxilavubabudozuvekisa.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b8c4966edf0657e7595d9e3d4f3a4e6b/tetisovafujusadufobojaxiv.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210902122407_487hl6.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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 17800 bytes
SHA-256: f6bb79541853885a19f46acec30d010a34cbd568b8f0691fd635e023b9c89001
font_01_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 10688 bytes
SHA-256: a0246c2a7f1dbbd8d2f5f0df432857ba930fb39d356c019288a6a7318e715f71
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1