Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6aceaef783136a…

MALICIOUS

PDF

81.6 KB Created: 2021-06-15 18:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f696dd7b8569375d4cc3e157eb502249 SHA-1: feb640666191331d8ece87b25f064c13ee89f083 SHA-256: 9c6aceaef783136a6b85347b7d0275404542c9fe244f062693cb64cfdc99a84e
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier output of 0.999777 strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'quick shortcut maker apk', further supporting the lure of downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=quick+shortcut+maker+524+apk PDF link annotation
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/orgmr9rsc0j7vath1tgfe8bci8/xiwipojapebiwufabixu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee567bffe---84721567562.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/nuzuposizid.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zarajop.pdfIn PDF document text
    • https://amblamy.ee/upload/file/vujapabekojujidumaniga.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2f03a891---61106637876.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/60060693150.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/gafebunudoz.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/0b7dd93d355351ae58c7c410017c2f66/2712763483.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7ee39f3c---paxoberazad.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/zawesanumigitukinis.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4lvvevgvr6as90h62neqc5h7ub/japukef.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/jurunumawikesonisa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47cc2094cd---lisenotarifutolimodepofif.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/penulukevipipapopeguwat.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af45cd0311---domulomana.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ab3123bad05fdc79e4edd0a999b2fa36/weporeloxu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9b7e43d---sejavogojadenipexike.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/buladikal.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_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 5196 bytes
SHA-256: 0b124b708f0be23f2b8e1446b3a7599685136df572887436f11c2962913460f9
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 5608 bytes
SHA-256: c8f2a9ce1f296b7744e408efd1789dcdff00293cc21375b3a54528ef6cf00971
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 11228 bytes
SHA-256: d4c86c286f60ad967bab80826a6d2a7593ab9aab974f32517f6ae3d705c7ff43