Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c433ee9c56ec7b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 04:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 28ca7efb99240b0076aabba8c7a95bdc SHA-1: 5b9e85cafeff66ff3bc8a8d9b49de0f1918ce9ff SHA-256: f4c433ee9c56ec7b3bc161d2f5265504b441ab2e9b707e976218af1d917c7e46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier clean score 0.1188

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
  • 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 http://malagi.pl/user-files/fck/file/11333315769.pdf In PDF document text
    • http://emailreceptionist.net/userfiles/file/24844383239.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4ng4e4rp4b7lajlsb0kq4sg8k5/suleniwonebesizakuwot.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8bb07fdf0a8bbc49dabfc54427a7db81/95713800964.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/89071488918.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3216e8af---saluvurasofebexukibute.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/97982384202.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9qgmd7u04aa4upttts627egudv/bilotugunemekalirogefume.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/subimumekemopugoko.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/l6ktkd8mi5buogjg6acrk939r2/56232482768.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a6b9de06f01baf9d5015977ccdb8b52e/vijufexa.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467c6b0556---63046690044.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/25784896159.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609515c6ab74c---18303527827.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/54664872093.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/43932906143.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/418fba78e2541d2b47f6021b11942d91/mezejopi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721a920afc1---fizumajavepizebemag.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b8511248---sowokeba.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e096b56aa2---7936176837.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/81503832078.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/semajosasexijirasajolawew.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/pobodexawuma.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4mi5p8lga0ihisnpsudcla6ljh/melarakat.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021052301658_151215107.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6a2083dd---tajapixozofirol.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/54708108273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+technical+indicators+in+stock+marketPDF 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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 18128 bytes
SHA-256: f7901c4243b5418856b774b10478e8e9ccd0008dcb8bc66fb6598371ef969889
font_02_sfnt_off00013ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 11056 bytes
SHA-256: 69999f2a7ffda34a10e08f378c528723534a225cdb605feb35d18d0a097ea0e2

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