Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdf3086aefa8b29…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 23:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d466434ecdc55e4f3e79ca6baf4fc1bf SHA-1: 6c97b9635071737cfaf895b50af06630fd7ad014 SHA-256: bfdf3086aefa8b2968d6f188161a1b003bb2c3e94b8025f6b8d681e2b948cf6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The presence of numerous URLs pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7e4aae12558c772f64ebadb4c55ea0f9/fiwagu.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/234f964ac109f154c11a5da2991730a8/pekurexinigiluf.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zelofi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6ba2a6df854fb57026f49b83bd28121a/72790801165.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa49d49b1d---jomij.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/6726980956.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/36150319445.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l1r93r43hu34u0vb4g020ko5g6/64692216677.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/94261373335.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/addvbfd1q02v9jej017k649vjp/xiwiwawuze.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/89537421352.pdfIn PDF document text
    • http://linker-apps.com/files/vezisinepufutovijonu.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/zobisokozurifivum.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9a6637d9f1f31ed91d840dc2c9a9e73b/25123354005.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/612091beda49ba18b229cb0c7925a6cc/42431856344.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/monarijefimobow.pdfIn PDF document text
    • https://media-get.com/userfiles/files/nebegabulebakaxizupoj.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6ba977d18b7c3327bf74b35f9a0ca85a/fifokakuvawelum.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/51379436154.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/171801283.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/44676579857.pdfIn PDF document text
    • http://goref.ru/files/file/dapaw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35032a0af---kamerexevizodejidalemiti.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ejuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120d59b6e10c---purowekoxegerigar.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/lusazo.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pifukituwukedafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=worksheet+generator+for+mathPDF 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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 15168 bytes
SHA-256: 906568a3f41175ea83a6328e2a91f016f84da6d6948d3b4e9dacb188f9b0f704
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10608 bytes
SHA-256: c27102e2ac20a19cb640b84c99410ea6f093f3346996163986fb84c91ee9557b
font_02_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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