Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d1fb0ce980ebe…

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 22:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a10000760ccc3bf7878f518c796e515a SHA-1: 7fd6826afcf35417ab904098c6051deab60a4594 SHA-256: a07d1fb0ce980ebe442c7930d0b27791852bcc74151b0fe08ea1cc2f148943c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations acting as hosting for malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites through a link farm. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36080d603---2586187821.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/294174da61f58d636a5b7b9eb70ae0f8/2972618792.pdf
    • http://abwcoliseum.com/uploads/files/23018342463.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28dd42ec7---tususopafusajavisovu.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/376d0581dea2f56395163c4e6a3ccd10/wunadage.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1k20v7bo78dseerd37mpkpcn1l/28622688480.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d5443dc659c4f23f5cc551d649f4e6ad/95427654010.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/napun.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e3527cce23f632a4631dea9e2a6a2f5d/50747814963.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q3m52udtfqik3rbbdqfjijcs26/mapudojuw.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/rtim4pv3ti9q71k0spuqp08cog/92312159484.pdf
    • http://jtour.vn/userfiles/file/pifonenovikalefaj.pdf
    • https://abe-rdc.com/userfiles/file/sefugon.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc2fb8f20---79985724633.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ebb1fc263749d50914d0667ffc6e156b/89409731699.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4c2c83e6e4cb9ffb4c8b9796dcd3e653/28585830831.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jixuw.pdf
    • https://alshaabcoop.com/userfiles/file/3704796290.pdf
    • http://amctop.com/board_data/editor_img/file/202105111013.pdf
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/nareleg.pdf
    • https://behagi.eus/files/galeria/files/64391838115.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/kiped.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6v6vjlr3jvmpnckmeeaqt75q1/53280082404.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nursing+diagnosis+for+patient+with+hypertension
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c9.bin
2032beed7559e16a86f4f0ec713f272b95f0d68133d67a3b293729c64afa220b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 11008 bytes
font_01_sfnt_off0001032d.bin
d4c6b17a7d55c7020d70b681710f2454854c16e4ab3cd71cefdc740adebbfdb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16868 bytes
font_02_sfnt_off00012f15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 16792 bytes