Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b00a97aaff8cddf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 13:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95a6620806c912b7c94df442ae0417da SHA-1: 110af496274dda5e8969f4fd1c5749b516045016 SHA-256: 3b00a97aaff8cddfafb30842fd1066bc247c32545551b76b408f781b3a058059
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to exploit users via social engineering or by serving further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bettynblue.com/upload/fck_img/20210518/file/73929778265.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610888daaab85---2313071533.pdfIn PDF document text
    • https://nevisnews.com/userfiles/43826208805.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/vefidinenafiso.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/41547617882.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/3218881191.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f540351f95---81420709247.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/40c44c543584a2e9c31ec4d3239b9315/43719741486.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210710_6AC54D086A9E3369.pdfIn PDF document text
    • http://thaide.org/userfiles/file/fizuvapasovunuxiwotu.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ebd6602e9d8d4440eb586b79bde13ea1/zusuvux.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rilogorupanadu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b5be12729---17349136686.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/sasis.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/xasubup.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/jilevovira.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/83700912481.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/86293999373.pdfIn PDF document text
    • https://mfdesign.hu/files/file/54236626189.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abd6677d381---lobetokubageroxuwu.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/38607452510.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/magin.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zagegetujisabepunesesimiv.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/nufisufesiterun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=genetics+multiple+alleles+worksheetPDF 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_off0000b9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E1 15736 bytes
SHA-256: 091c5e85b1dee455756126cbf4f5a936e15413d222d246ac97dcf539f48316f0
font_01_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10956 bytes
SHA-256: b2dcc439e9eda791e68e886162caebe0b32e89362cdefc84f5517f1d14951385
font_02_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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