Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf6d852f3375f0b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 23:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bbc27e2d7ff1d708eb144fe512f23a56 SHA-1: 6e62af483c53fc9357a97777f2e350b030197dd1 SHA-256: 1bf6d852f3375f0b1ea88de2f21bececd7cdc105a75f257f59cfdb4e45d41855
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attempt to exploit user trust by masquerading as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tidymoney.com/ckfinder/userfiles/files/ledebux.pdf In PDF document text
    • https://cuatudongnhatrang.com/uploads/files/5002223932.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/82414205547.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zixumuzidutuma.pdfIn PDF document text
    • http://youil.org/userData/board/file/24267124861.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/dakuxanowivud.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/zisofinizivedevu.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/xoxovimefupedid.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/43263670922.pdfPDF link annotation
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/merosijula.pdfIn PDF document text
    • https://salwangurugram.com/files/worulawiwelukozez.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/duxagojigokikuk.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42f406303---jaselipavuloxavatesito.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92515683432.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/84686051958.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/xovabukosuliwapomoketexu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161304b8840b57---dekotamoj.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55588976282.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c8ddda1d79295533bcb1e04a1748b017/88853752823.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bumobozetod.pdfIn PDF document text
    • http://alptw.com/images/files/77688198502.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/kanusawexejadasemil.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/74258779360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6b235b3d---nolusobemukuketuripifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=valmiki+ramayana+pdf+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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 15000 bytes
SHA-256: b9886a345cc8bb2910bf50f25838036c79e101e92bd3e5944b69226f83b70ff7
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10524 bytes
SHA-256: 41e1954e6c411e4fc250c65e325e130432ddc7c78313d1a8ff8f20c1b725b9f8

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