Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d0ea3885e8824a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 08:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9eb1b8afb0f147ac207e73186289af72 SHA-1: b9ec5d0728b7f81d4ee70db54ff76e7bb71d6132 SHA-256: f8d0ea3885e8824a9cfa9479d5862c629fb4117d62924148a5e06875a5df031e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=pdf2excel+online+converter PDF link annotation
    • http://maslag.eu/userfiles/file/newemavibabazelirevebo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1fa31f531---xojimexuxufavufijefe.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/85602517850.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/77138685548.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/90743943575.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/72858021254.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7042c15f---vazapuguxuri.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-1/20210901051624873775.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/kadugubava.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/58324397245.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/gugosuseka.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/deb8l17acutcdcdmivt54vj2e4/68620193400.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/16762542709.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/20783126938.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/besalip.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/budemeruvapetikupup.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/95ceef888f22f9037cdb0ac89aa31e7f/nibini.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140157d5d68a---40668818345.pdfIn PDF document text
    • http://zxsolar.com/d/files/norawavipupadelizaxeb.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090210480373499.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/lazelevisavepurojerek.pdfIn PDF document text
    • http://www.agot.pl/upload/file/69890703162.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4f3b406c---60597859856.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_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 16348 bytes
SHA-256: 3f47e07a86aa251a42be9906cd336cc14c995c05e6cb284206cb69f4ccb4897b
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 10428 bytes
SHA-256: 7ccfbdf5e8ad4f4ef6c278a85e48c17fe5d69af49fa58077bc9efc5607f6c311

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