Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bc226a609c9d71…

MALICIOUS

PDF

99.1 KB Created: 2021-07-26 03:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b2d6713f823e81d549fcfeedf36a9486 SHA-1: 72d3cd14670d56dbd725d6adc888928814508380 SHA-256: 21bc226a609c9d71d953947b2802a71497704a88014993e71aeae08121771242
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405741d445---89998194573.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf904377bfd---sagejeriditisununiva.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c411954e6c6eac9ad9cfd0ff5867c214/6094079558.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/48835923555.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a7673a2de938a5846582c7e608c7cf9f/99566521176.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2ms3222pd87vav8hvrmjlrvv12/vuxuz.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/14919644829.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6tfh8qdc824a4kkg4jk6cvbpa6/welotadisetukezuze.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270432279275.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/57317793935.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb962480b---57962674772.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/29ccfbaa38d5afbae749da8aecc480b3/60428655222.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/19c8fa1058d85d3f4c7aab1ae640ed7e/pibaxopetibex.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad50005be57---64668369048.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/69157635128.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/03b7d1ad09e427fbc069aa5b5fc82d41/farerex.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850d6ad8f7---99847472002.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c52d554ce33cfeb45e514c4d72b24394/dogadogex.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/54922694650.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/14536172948.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed527c51c---1709918680.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/sosunowunaredotufidiriva.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/papirelivevedebe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qth1s3ja4p7mh8os2ijq1a3jk7/50966103775.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0e7ac868d24e7ccc6a181ecbd2e69e69/bedamofewakapo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zejojeje.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/wexudozogomepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=windows+xp+telephone+activation+keygenPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 17576 bytes
SHA-256: 445de9a862e2e15f2cf98f8d4bac2eafc78152a1e46f6c1a7c8daa84b937bf50
font_01_sfnt_off00014b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001633a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633A 11144 bytes
SHA-256: 1f273ad89afddb454deec769d1d094ebc356de8791f31f5d65acda85c9b87b5b

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