Malicious PDF — malware analysis report

Static analysis result for SHA-256 4767d5f1f41cbb0e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 23:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc99c69e2d81f921b5f03a5ef0baadf7 SHA-1: 95d17bc28d5c39e8da9005d94a9eff63d38b6150 SHA-256: 4767d5f1f41cbb0e68d87b5a652e307f7ed8061352a8bad8f8fbaef367d12e94
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to distribute further malware or for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6900

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://atamergranit.com/userfiles/file/51939441560.pdf In PDF document text
    • http://georgekoldun.com/var/upload/file/vizawazigemaxewu.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/40777053821.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/tikojirutiwivuw.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/54516628673.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vonafifudutodexewenuf.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/sowirevebozukaga.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/ledasixefafofidafeb.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/79263337427.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p0l9r6tvrqh28ved5r4g7m5tea/64581664473.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/lawotafug.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/zugopusoxaf.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/puzegujipuzadiduw.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161050e02ce50d---805162482.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6171e0e7c---merimifegum.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/972711203b14baa18b53bf4d2db71c05/31038169418.pdfIn PDF document text
    • http://zerosquareonline.com/file/12235596463.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/30961e4858d00c48b9d6b5d62643cc2a/najobelerexadiralilup.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/15470650753.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76a350239---92996617468.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jugurakejimope.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608280a9cf75b---6429645752.pdfIn PDF document text
    • https://bauarch.bg/files/80870859097.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6ece36a0---radinuvarijegekexoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pattinathar+padalgal+pdf+free+downloadPDF link annotation
    • 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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 10696 bytes
SHA-256: 2d6ec0e32c524e35b4ba86c9fd5a0483a0e28c578d5ac9ba505fb353475530d8
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 17260 bytes
SHA-256: 44ce469779f2ab901fe7426f36b2a47feda5d36854c3caef590764f3be2864ce