Malicious PDF — malware analysis report

Static analysis result for SHA-256 566cc2477bacada0…

MALICIOUS

PDF

86.0 KB Created: 2021-08-30 08:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 164e8103b0769612999c7e5c08390fa1 SHA-1: 9d286a23f8415968a9a4674b63c4a3886b37ffab SHA-256: 566cc2477bacada08e4e9c558c54ebc153ca9e4d31348e430f18b5f2ecc04901
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5837

Heuristics 5

  • 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
  • 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://pnktools-th.org/ckfinder/userfiles/files/93287503127.pdf In PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812de65dbb7---wudilodiw.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612890913d891---tawojevenojilide.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/8bd63402b55e2165b7d2e8f363419285/ketura.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/33531062792.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c235daef01c---zaropofaruwodimakunap.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/notiredelatisar.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/84808969884.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f84db0b1c---bekusekozin.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071ea398f844---jovuxejotarifenexupe.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504141756333275508.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/josivurilonar.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/mijowokowiburone.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7f26b3179255cdbb91d8297c3d261d0b/pekig.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/83796914901.pdfIn PDF document text
    • https://digireg.se/upload/tupowumuputifim.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nirbheq8ca12i4f0k6vvi9isk4/lojiku.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gqssqa6up9i244sc77ab27bqah/86800838693.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/duwesovaxogajakiji.pdfIn PDF document text
    • http://maihome.hu/admin1/file/96118983571.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4oacikbgvt4erqe5tmunp2t5b5/lefuxuvupibesevupigo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4931f3f08---10635110738.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16098943064a44---67554611536.pdfIn PDF document text
    • https://quaint-house.com/jepuxuwalenegawojujapela.pdfIn PDF document text
    • http://cocoal.com/uploads/file/wunigotodofun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hewitts+snow+removalPDF 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_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 17640 bytes
SHA-256: dbee6b46601f4af27b8edb74092f7fb0edbcef881cfb5a6c087a22f4935efa87
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 18044 bytes
SHA-256: b02be8cad12722f2c10fbf51c01aeb4a7715fb17cdbf83847fa9d04ae712ec90
font_02_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 10412 bytes
SHA-256: 480c4f60b3f50911db9ee304a68e1907cd0636597d95313a17c7d87c1fb8dc1d