Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc30aadd5e502656…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 14:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 703ba47e7b3c7167a751c75e17c799bd SHA-1: c90e68f786ea1581b398268ede4addc20194151d SHA-256: cc30aadd5e5026562673f71210849dcefd879664671e174df758d0848e9813f5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the compromised hosting, points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=bloons+original+game PDF link annotation
    • http://emke.hu/uploads/ckfinder/userfiles/files/46470108852.pdfIn PDF document text
    • http://askaudit.ru/price/94220487365.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/pisulaxowaxuxov.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/wixobipamuvowonofonebi.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/33493782992.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vaxapana.pdfIn PDF document text
    • http://debten.net/UserFiles/File/tajefovavupotexojapeke.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fe5bcacc0751e9fb9f79812e27b7981e/luwipogobofib.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/59154541607.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150da28e906e---watovitododitamejeba.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/57094276573.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385037a0fed---20678762207.pdfIn PDF document text
    • http://neuroxl.com/images/file/66296407129.pdfIn PDF document text
    • http://www.bash.cl/media/file/39995274625.pdfIn PDF document text
    • https://anup.bo/images/files/60264996079.pdfIn PDF document text
    • http://montereypark.kopanramen.com/uploads/files/40589481850.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/savode.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/28366935231.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/fiwedu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xatofed.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60292202871.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/90771751194.pdfIn 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://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_off0000b023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 10404 bytes
SHA-256: d56eda56dcd1906d60f310e913595c3547fd94e3216737921bb78a8db6346c75
font_01_sfnt_off0000c7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 15872 bytes
SHA-256: 397392e59c71246c6c1214f77a3ea39f82cdb6d53828d7bbbdf188e15ab7d543
font_02_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1