Malicious PDF — malware analysis report

Static analysis result for SHA-256 52795e8111fc9d05…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 02:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e49dd5511d539059d5e3e75b650be800 SHA-1: c173bcce9ec388953d7351a5ab0e3d807adeda49 SHA-256: 52795e8111fc9d05b6a91b31da8745d41c804146eb1bf35ac69e6fdb1d2a5168
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate it is likely used as a lure for phishing or to distribute further malware, aligning with Spearphishing Attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://queure.ru/uplcv?utm_term=to+what+extent PDF link annotation
    • https://tommytest.dish1314.com/data/html_editor/files/98144542966.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/82981933324.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gobidifapomat.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/sijimomawusaduputanarozi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/xakul.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/gedimobimorezetitujub.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109121855349201.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/retoniwepobeleniwobus.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/sufesajekedofelipafibi.pdfIn PDF document text
    • http://spiregene.com/image/files/20210915_223402.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/mitasemeronoxiwurewog.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613284498467d---felulumatufevuzuvef.pdfIn PDF document text
    • http://mp-journal.com/media/file/90667679148.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/20987844509.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133656fc5778---witomerobeviguwawujero.pdfIn PDF document text
    • http://demkapi.com/resimler/files/40307039397.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/varoxinavipoli.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/76316651548.pdfIn PDF document text
    • https://eternalbliss.net/file/mazakebut.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614214ef5612c---20195777102.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/rededu.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/57616067786.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7872d221---86253656114.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00F 17092 bytes
SHA-256: eb97161b087232684ccb8e6b6b7922eb1d3fd710f8829cc56a1573107c0547f0
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 9948 bytes
SHA-256: f51c320851da9bca24128a2c597242106fc08499cac157f138310649bcee678e
font_03_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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