Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcda3ee00da714a…

MALICIOUS

PDF

91.0 KB Created: 2021-09-08 09:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54fff54204eb1a23962d9c0c8f87ee4e SHA-1: 2b9ea06d7289651d91a5a221aa3fa8edf042e92b SHA-256: 1bcda3ee00da714ab45cde4e577cd9cfd0cd4a30c70a0487fad4f50876ec6663
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified multiple links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294bbe8aee4---panulasujeta.pdf In PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zegaririzosiriri.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/wanujafosilunozi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/461d17d7ae9ce3a3a536d945bbd18a23/72307850703.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aa8f2355---pelugimofasuvizixusozela.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/65211717351.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f6b9d7783b8f9ce2d52e1d749f8345db/64381971815.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/94490273079.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/wawadurerafokifel.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fomudomiwosudiwatu.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/38123827360.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/76013963278.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/80348377487.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/66936234510.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rg97a4r872jni85r8o9e98scv7/47328756986.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/o69cfa55ahrmkl3n1p6tassgqv/gakemiloki.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/xavoju.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609580d04211f---49627410048.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210830190822_1081985098.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/38909142210.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877968dc4---40222495459.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808372c45d2---vipeweteb.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9194bec47d26c509026e53d9038ad2e2/legetujuraxodobalagep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tradition+meaning+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_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 10588 bytes
SHA-256: 1df57a6c93b81d1e1cb1385b3e1b424024548ec5f21b8c1f58fa355dd6fdd7f7
font_01_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 18580 bytes
SHA-256: 3873068dafbc06779693d62dc4bbc9bec6750764abdd4e6e8db66995a5370a46