Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbacfba95d1e4aec…

MALICIOUS

PDF

83.8 KB Created: 2021-07-16 04:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ba737853dcf77a2c83df718ba4a5439 SHA-1: 0f6727cba347c7abc9932b1e52d827ab726237b3 SHA-256: bbacfba95d1e4aec903b8ff1f3ed10b9b25b2a8f14982874bcc583d18ef28daa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and link farm structure are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://baxsporthorses.nl/userfiles/file/basej.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856ca259099---15769952145.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/bametirasewev.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa60522354e---vilasobibexamupututab.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/3d0ae2c5364824861c64620880cc55c4/rewitolapegagarow.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/213e1b4e53417ad3c42793a2c2b5044d/41703729990.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/26513049277.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gc2uhnh75p4gnk54itsf3iol48/terixuzot.pdfIn PDF document text
    • https://hgb.se/filer/file/92387129192.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/ruvedezizisadawiru.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9or05t8psi1laeqvc7h2i83e2t/14299421521.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096309947353---70518539835.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5912f5fc89ae3ddba24900e27f91da32/51574444016.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/digunopur.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94841e7627---4753518519.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a238c89d52e---muwomekozewuwelajiwi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/zozobubegudiwaselojovew.pdfIn PDF document text
    • https://cncunse.com/d/files/rujogepexixetox.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/likoxebasosini.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/93747689455.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/rburm554nml3m9p7uktc5bcjjk/luwibovu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/94976651365.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/48662566824.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/watotidaxonofirap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+call+international+on+cell+phonePDF 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 10380 bytes
SHA-256: 6e831f7f60704a43cf3876adda6ca822dd3024beca94d5b603539f78d318395f
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17028 bytes
SHA-256: d4c9a3f61531ee7c1c2f729d6cfef064230f0ca1d9c7f54b9b0e8de71ed049ec