Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b933f66710ef5ac…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 06:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7a94dca1bfb376724abf7ce4768508d SHA-1: 10a4e518f6b76da885c26ad521f1bc28760f26fb SHA-256: 5b933f66710ef5ac9cc9da3b59825479a88322aa9e7790022ff2fd188c349a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of a URL with 'clash+of+clans+hack' in the utm_term parameter strongly suggests a phishing or scam attempt, aiming to trick users into downloading malware. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=clash+of+clans+hack+99999999+2020+download PDF link annotation
    • http://auto-spec.ca/fck/file/95727145702.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/zudizimuzifi.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/9450824588.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/muwefetoxijeg.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/98540415402.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/loralujabafumufafi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/21266885055.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b2d69114---33882437050.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/mujakexu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/23945815338.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/67738539969.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/96570761137.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/vadopajaxezareneg.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/veverixolelawumusepexumov.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/vufoferakuvawukoxazuk.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/dujojadomimituwi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b799b5a3e3bcd886538dd9f2553a959f/kelodupiluxizilifezimapu.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/16828487151.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/28351598448.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aa0561c6a3cade22491c8364739d4c37/7185246113.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/48400833557.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/tuketinalexanalosifaxo.pdfIn PDF document text
    • https://atiksigorta.com/files/1757992195.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/10968237010.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7329723219.pdfIn PDF document text
    • 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_off0000b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 14680 bytes
SHA-256: e5c5facf49cc7953b6863f25d3d10ca9e9f7ef9dafe729f139ed9d52d1483b3e
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10768 bytes
SHA-256: 5a94c610d8288a82566b57aa3996542e8b24fb0e0e05fced8ab6099b20fd0246
font_02_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1