Malicious PDF — malware analysis report

Static analysis result for SHA-256 d366c9bff4b96170…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 08:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6973a8637f7f8d79182b1dfa51fb98e SHA-1: b6fe36a7af9401935ee448abc72ed18c35840287 SHA-256: d366c9bff4b961707ae3da6007a514fe008f8515d92ab3152c10c3283640a955
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that leverages multiple heuristics indicating malicious intent, including being flagged by a ML classifier and ClamAV as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to download a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b402ce076063f34f8f624e489fbe4f24/50327996174.pdf In PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ksocu0g1mte9bmteelv96kfj3p/6243824786.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608097dbaaab1---fenuzage.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/lanetavafudupanamakorom.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/kisosutaxavuva.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7bcbeacd---somijupam.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2qi4ohvj8b2retppv3rl2e0v87/93096770893.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3af02abb64fd13f2cab02f1d2dbc028d/mosopematefes.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/16745694779.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/pawojenivilitokozitom.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b7a077f---90104923838.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/nurafataraw.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/44s3emhs7b21ddd2evkq2sa8pd/xovenokepixidebi.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210621190555082.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/kevewigavowaxiwilimi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56bd9o5knldcu3lfpbmoffbe9m/91100564154.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xakoxidedelo.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/38021279694.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/59310115076.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55cf6e9706---26651424155.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/foranirodozepavogozotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=international+calling+app+for+iphone+freePDF link annotation
    • 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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10544 bytes
SHA-256: ed930df7ba964d4c6f99fc4643af5183fc25f33b9adaf82ea234426372435723
font_02_sfnt_off00012298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 17584 bytes
SHA-256: 265d79b947cb1f85ea7beea50af612891748c3c2e24f179f359ce25cc6fe1f4c

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