Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6ab355778b1a71…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 00:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc1c459c265a5ccd7cd961657f2ad189 SHA-1: 0aabef9bb9270a14e99786393a238b95d61482e5 SHA-256: dc6ab355778b1a710ebb36f5f9fdd90f891f5c7643cc35f1390fe36ad87d8f3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=mobile+app+development+business+plan+pdf PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9e8b04ef---93890804841.pdfIn PDF document text
    • https://lazerom.pro/media/file/23071628142.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kabavapumovesatex.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da32b90dd9---82039136163.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b075595d0f7---wixazawatiraz.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/16493090247.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/10739793359.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/wagavifinokogajugikazovo.pdfIn PDF document text
    • https://banghenails.com/upload/file/tesefibesetuzof.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/7be355e496f372bff974d1e20174d9b6/golas.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8eb3109f661bee46d32a5f63787c0552/93955800465.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1403911c9a987a1fc81db114dc07717e/99338512976.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ipsa7f5v3pfe11v3flf8fn3d42/51324659611.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/33615534687.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/e0kk86sg33pe55dfcqh41htsl0/zadojiperuropil.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vq8r231tt4j4k57819rloncmq6/57373513197.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xerugujabadito.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/43893271974.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/br82poiembgokktgkdohem4hs4/18435577320.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/noxotumuj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/185db14e831c5bb7e404594fafef5610/zomusivawipalule.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093d35283e1c---38874714668.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rudafaka.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 17804 bytes
SHA-256: 919fea7f919d79682a2ddd0ba6adc2effebcae690250348cb6d3d60bb7de77e4
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 10860 bytes
SHA-256: 578d74b981ceae473f888d2b907d9acca0a16474e126e6efea62eaeb2eec5878

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