Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26b38e7bc1b02ae…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 11:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1bd31c5e1beac90dbca78e33f30b0b4f SHA-1: 59034debeb73fbd901af69deeff203a611f80527 SHA-256: d26b38e7bc1b02ae4b7885d86b62de815c1ba7c049f23c81f1e0ecaae1afa252
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kimtuong.vn/isc/public/files/fckupload/file/88467785170.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0b81fba6---33225623949.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/mopenilisexeliriduwepoje.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/76424682750.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gibamovafepab.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/febevoruxatapikazib.pdfIn PDF document text
    • http://banquat.com/userfiles/files/2890878345.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348bc3783c---nazajagudadixetukaw.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/bovebiwuravuzizo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/04f569183cd6b90644cb1691c6ceaf11/34446000619.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/tudavixani.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878abeca730---58860488313.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/69833646836.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/52b0na2lr1992m6vq99m1v4b93/kuruvid.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/75f1ac8d6fa19ecb83d2d8c5cbd1ff78/visozuzupubetezateradug.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/wogoregovavaxoxabel.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xuvoniwe.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/quuqt0khsiks2fn1rlsq6rkvv0/46382650858.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/dikitaguzorodu.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/rimireloxivenizupuka.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843ef1cfe3---44514358776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=water+cycle+worksheet+for+kindergarten+pdfPDF link annotation
    • 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_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 17292 bytes
SHA-256: df1b1330acd0b549a1c68b92c73000c9b1ecaff00f2ed447b16d16aefe0e850b
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 11184 bytes
SHA-256: 4e97b4c0be6a6df7b194b92f321be3e9a8d0c7e472b6d52e2049226565b081ac

Open this report in the interactive analyzer, or submit your own file for analysis.