Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad944da5f8a6db4d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 14:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc54fa96c3fe501991d1b7a42f61ff30 SHA-1: 68bdb5c67394d4feabd1d7d255fee917045a1d3a SHA-256: ad944da5f8a6db4d4466c0a173a2ca272f4fb1b755040f1faf207ef60066f58b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content, likely for credential harvesting or malware distribution.

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://hlj-vibration.com/uploads/image/20210901/files/20210901195948.pdf In PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/73415420997.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/zewedufoji.pdfIn PDF document text
    • https://ptogel2.com/contents/files/gipesokajufevidonililu.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xutugonigigoka.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/14177392897.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36e9613ca---bitesopi.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/46319302167.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9fc3315e3c5aa6f3f147ac48044de2ec/kisebixalilofunilopafasal.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/tawelutamafazivazotozoboj.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/53834290536.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/nowiderikatexubolili.pdfIn PDF document text
    • http://www.puhito.hu/uploads/65253771689.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/12995138190.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/puvikiwolerewenu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090508072689.pdfIn PDF document text
    • http://pachinkoevent.com/sites/default/files/file/56651886925.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/dovur.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cf63e11ab8481b94fb23265a00be2c43/52947139197.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/dewatabafijebuzejulabo.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/ronuguxulijilaxinara.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tumifuterupixo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c21996f---63310884857.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/noxuxafitojawisivam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=singga+all+songPDF 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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 10028 bytes
SHA-256: 365d177ba5140b6a3b6f9f2841a8d835a49400fc93eb73157532049a958b2033
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 15160 bytes
SHA-256: aee61285b70cd9703af97910a4a01df1d42c91611ff648b9bf29fe95065cb4e0

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