Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27bb6f668a63c11…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 23:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0260d326d2f6d5267d177b190694cba6 SHA-1: 261b246afc8f2e8da5e484e78c0dc7a0b526cd1b SHA-256: b27bb6f668a63c11a1ed4e9b2fcc6bc6bb7bfadf9186d874ca4ab505240d789d
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://cesurmakina.com/userfiles/file/kukeginalatanuja.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/17337227029.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/269078bc2310f260c295db5aeb0639e8/2839761734.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036df14e18c---11191960248.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df007b6f7f---44135863421.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/95961637781.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/260bb2b822dc2df5d8aa1be475e464a8/73174355777.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ade3d8b3---vefozenirafuzovetunuzeg.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7un2ru6g3av9fh8pq6f6fjv0k/mutakopofevaso.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kn3qgt5bjotvkmu3rfdk99du65/29660456627.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f49a85fd6---zevekukobuvata.pdfIn PDF document text
    • https://egca.fr/userfiles/file/suxulidojeromuxiluzixi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cfcf79f---12947268228.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13a627e3---letibinutajodavupebaram.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/24924568433.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e63f0daa1---bosolunigikagajipawudez.pdfIn PDF document text
    • https://basisnomor.com/contents//files/seminigulewanal.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/51d5f3e9788639b8c29f46f84c9bb253/38451932262.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070df26001b9---21405262331.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5gjn6o04v79rq8csr6liivt3de/38878426764.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vuzatunalupiwowezojixajaj.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/topagadumozowuzatufepa.pdfIn PDF document text
    • https://mangallagn.com/images/file/78002159092.pdfIn PDF document text
    • http://www.polni.si/Images/files/rubuwabufodosef.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/69257628612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adhunik+bakri+palan+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000c04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04F 20012 bytes
SHA-256: 626500f7751f27ac33d7498356c9cb9fb0303b2fbe15c131a2c4dfa2d3cbee1e
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10512 bytes
SHA-256: 5f7ba1b5f2562513c31fe461fc57a44ec84f9473a31fe5844a95e0f8f9315f8f
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1