Malicious PDF — malware analysis report

Static analysis result for SHA-256 736a6373d425a931…

MALICIOUS

PDF

86.6 KB Created: 2021-06-15 17:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31370a763cdb8133823ee575a9706ea7 SHA-1: cbea9680e6f7c00581be437d2cfbf5ca2c62dfd2 SHA-256: 736a6373d425a9313b5d57a67f8b38defec2cf07784cec26093ed443c794ea5e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain metadata related to its creation, further supporting its role as a deceptive 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://medvor.ru/uplcv?utm_term=the+kissing+booth+road+trip+read+online PDF link annotation
    • http://jpind.pl/userfiles/file/tukuxoposekatebifugefow.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/08svk1vvl0l2ajv53vd68jj03i/gigakeri.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d26882709---41056296791.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bc3d8351---57518997381.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57aa4236b5---77589927856.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/020ee3ce9ae5918b7e7814ad54665948/kojipomedef.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc36e47107---85899324044.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oimot296i3fkfvvmo6e8k2og75/mefosetutovimalulog.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/delel.pdfIn PDF document text
    • https://mszukam.pl/dat//file/24837301348.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tafemuxudipalijot.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709e687ecf---zedabejeximemuwaron.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pefufijebomos.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0a77885c9ae3b812b69f4bd0a5b33b19/nonekuven.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/40d90a317dbc9131db645fd30498e6ad/tunuvotibazedukuruwefiwod.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/famuka.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_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 5376 bytes
SHA-256: 1bec493ac99997cda7be7c6ba7378350071d760ff35f6fd0c460a87dc23431cd
font_01_sfnt_off000127c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C4 11288 bytes
SHA-256: c04aa463f9844cfe34f75ca94d07051ebf8bf7e76e80bc2afb61c9fe243b4bf0