Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720ef3f20ee82c8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 13:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05519718061427eeb8205f9f6f9e8201 SHA-1: 5cdd907dd697060f0df7965db65bf2819de9e263 SHA-256: 4720ef3f20ee82c8075804f1efa1d41f9af0948cfa58ef9264ba8cfa5e120a47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure and heuristics point to a malicious intent to redirect users to potentially harmful 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 https://nieruchomosciturystyczne.eu/files/file/89905358886.pdf In PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/zizetibuvax.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/zikuvezitexetumoderut.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/madusatiwafatejejiwilo.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/bowusifi.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/fubinoredomefidizow.pdfIn PDF document text
    • http://glassick.com/userfiles/file/wobuguvunidalokoloras.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/54982921100.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca5692ce5---17850528912.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/70854495956.pdfIn PDF document text
    • http://pololanna.com/user_img/files/xejowisu.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/pugarolerumulevesosa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c149f5b0b9---denojuvutamipij.pdfIn PDF document text
    • http://soupworld.de/upload/file/77637692242.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/nilewitipodutinomesixo.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/tugopum.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1cb6777181b7529a9b517de78d7d288a/79682092576.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326da534a30---8954442020.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/73325315639.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nifujava.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/17027234625.pdfIn PDF document text
    • http://viorina-deko.com/images/file/soranevujupeb.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/rulut.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9ui73f9rjjjgvpvgv2l62gurvk/sokowugipomivabefulogano.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/82948959710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pdf+converter+apk+free+downloadPDF 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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16068 bytes
SHA-256: 44e2c87f699762e5ff04b2053fc6c4f03ccf399ec02fbf0bc21db43090c528d1
font_02_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 10596 bytes
SHA-256: c77c79edb897510f4e3647d5a29af76b231e74dbfc20233fd302bcf7b5843a20

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