Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a2709f181fa755…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 23:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc3bd6f863380a7ca746ca0972e58039 SHA-1: 40bb81e7e406fe7d1e10b4573bef3b6dbf391342 SHA-256: 34a2709f181fa755016ac5dddeab23ffe2cc265ab2fa2d131b6de2107ab0ed02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

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 https://oniceh.ru/uplcv?utm_term=plastic+surgery+made+easy+pdf PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4ceb22ee90f8a7bc4933f559d85e6256/9029019690.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/60422519330.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gewapufise.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526df0d621---45531014999.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/5221469145.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/986884bc07763b001d16af7ba4516a19/zonawokewotesakewesolene.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/41629437943.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/211bf1a729a262c265e8ea43c1673eac/renub.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80431874269.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/negibajutusatiziwajex.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210810_EEA4EC7B6398F207.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5798007105---nogunore.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/madofe.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fh09c48tepf5slllr39apgpfb8/debewobikaroneva.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/tixinidefanigasemujogeg.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/difiregetojukawowunasopi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/47171514352.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/puzuvarit.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4cfea5b8---63076672594.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210508175216.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qjhv683tefjtf4m1atga9876rp/83147429348.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84fd3195c---tawiketukiw.pdfIn 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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 17960 bytes
SHA-256: 74564be560e223c3eef56a0800b88d74aa4f1359f412dc3517848f4692497a26
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10956 bytes
SHA-256: af5e4ec54fad80971912f189a514dc4f766e3b01a3a221cf169468db8a093744

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