Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd3260eb8795966…

MALICIOUS

PDF

135.5 KB Created: 2021-07-30 14:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67fdd0a0eefc3c1735dc59cfafc37e6e SHA-1: da73118591d0db99cc657721573568b0a56d2e9f SHA-256: 6bd3260eb87959660e19c8ce6a2dea1848f850db453b69c53e68a4cd9439dbb2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use link farm techniques, suggesting a phishing or malware distribution lure. The PDF structure itself appears to be a link farm, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f7623a9f---ratovinitulavajejem.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b400196d7ce---78463643934.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/rikepuzitoluzobamer.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ecc6a0a8d3f6c32c9b66687eeabc12c2/43267629147.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdd7d197ff---50770575728.pdfIn PDF document text
    • https://onlinendttraining.net/files/42013796329.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/730sk5b82cr8r1rao20risb422/kamisufixi.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/fuzediwopi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5b7c092f46ef29c1c4d7e9254a876007/merumafejapatezux.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/fusuto.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/12274828920.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/99761314642.pdfIn PDF document text
    • http://techlan.pl/files/file/98485602616.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/13495590247.pdfIn PDF document text
    • http://climtech.com/files/files/guminofutebos.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/73458717399.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/140ltbvmlfin3cmloq4rdmvpb4/61967221424.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160926ae997f6e---85783419139.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/tilasaginotubabe.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/7a0uelf8lqko8s0aoh58u7hrmn/ralatuduloxuxun.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/23223148295.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/5973181721.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/77593375191.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/paruzorisuliwokag.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a161816cabab5081ee494060ac549037/82455195182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+philosophy+of+teaching+and+learningPDF 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_off0001af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C79C 18400 bytes
SHA-256: 822c3e6e4167d4bd6358b4d820a0eaaed1c1a2bbf3c8a4974d4d097db6d6737d
font_02_sfnt_off0001f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F666 11004 bytes
SHA-256: 133871dd7c4d17bd5c362d2b0e8c10d825c3f0796130d1b0902f629167de55a5