Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05ccce449fbd440…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 13:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 128cf7a151b744b109fed2b61c6f27ea SHA-1: 5f996007be22811f99948db1253ba0a84577274e SHA-256: b05ccce449fbd440ecca3650bfd0667bd2f84c3301f6587ed337810a3fb55368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple disposable or compromised domains, designed to redirect users to malicious content. The presence of numerous links on potentially compromised or disposable hosting suggests an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://metalzilembo.it/userfiles/files/56989882719.pdf
    • https://tasivn.com/upload/ck/files/99688236889.pdf
    • http://caogenzhiben.com/filespath/files/20210910152757.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a0a4c77ac---80784323054.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bd5b333841543f4f5a12cd253dc3ee04/97480428452.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/domerov.pdf
    • https://dialogueinpraxis.net/files/docs/pewidulowumopitafem.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/98233352136.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/17703114564.pdf
    • http://nacyc.jp/Upload/file/21295250959.pdf
    • http://zoo-foto.cz/userfiles/file/67755714021.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf90312a9---zowokagufarusovufo.pdf
    • https://mashura.co/userfiles/files/54194217298.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/66408642423.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/35df445d109e5fe5ed6930f890add078/tebuzenojapif.pdf
    • http://honeycontacts.com/uploades/userfiles/file/pebolamajiwosirera.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewapukusoxumidopis.pdf
    • http://klaaswester.nl/img/file/podediwoxowubez.pdf
    • https://laurallo.com/ckfinder/userfiles/files/45003207483.pdf
    • http://gemwishrs.com/ckfinder/stones/files/tibufamezu.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/53333839519.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xixiduzom.pdf
    • http://ping-property.com/user_img/files/wugoxeriwexufugutalikafa.pdf
    • https://autoroman-service.ro/imagini_ws/79401923672.pdf
    • http://biometria.pl/photos_fck/file/74140189469.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hello+neighbor+for+android+apk
    • 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_off0000b047.bin
446bd12a99276da665ce3e9d328e0e80232346b65e35ef990ce257965aea6b54
pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 15020 bytes
font_01_sfnt_off0000d66b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 16792 bytes
font_02_sfnt_off0000ee82.bin
afda1560591faec1070d5466aa3cbe802d6196779a39304fcfd686712c5d69ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10732 bytes