Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f72413657cdc37…

MALICIOUS

PDF

79.1 KB Created: 2021-08-27 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e634323dfe8873a263840a27f67ff42d SHA-1: 0e8a5e486d7b4c948fceff1209d0fb6d6aed9e67 SHA-256: 28f72413657cdc374ce9526143bbf2952517986d55c1f41f7d891bf6fe11706b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

Heuristics 5

  • 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
  • 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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a72f0d05634d27d66313c01f5af35439/wazufedudipixisenokif.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/93300478156.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6f83c333753cfab0c6fd79eaf4493491/49664862003.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d0f50b951---bijomagowomomo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffcac4c23---84310010677.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/46949806474.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500276e2d---32930782708.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/gisepetojezadodisava.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210518/210518195111870410k5zxahs73bg5.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/63797977052.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608521a00e3f5---5429404949.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/53300037701.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607936986d72b---84606537837.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/95368782405.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adae79a754a---70334066576.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ca8m43jttv40tfj8bcbim31aho/92052512369.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d2dbdb59---mivojonubawevewefevonuto.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/2593640195.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607541068ff36---32426757862.pdfIn PDF document text
    • http://budka39.ru/files/54060592832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rd+supekar+computer+science+11th+pdf+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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 11260 bytes
SHA-256: a143090c1d9993444754e2e47174307de9c0bdaf8336e2326b20e6d02d912a5a
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 21456 bytes
SHA-256: 5638af056a4bf5dbcc35ead3d62ea8c6cefb15e32c3b06bbf8b6520075f08585

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