Malicious PDF — malware analysis report

Static analysis result for SHA-256 00665bd875e24cdd…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 05:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3198c4124b6a588c67ce8029528deb1 SHA-1: 9686dee42c0a69cd557141abf7a11d397150b951 SHA-256: 00665bd875e24cdd006bd410b19e99a431341065c78d2db67833f2e988b73b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://mail-business.ru/uploads/file/24066178310.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuwotejipib.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/mifamanelav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76ab8a473---13241855788.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/tivozi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/dbc5f931fcc70f027988c81c82bc947d/dodejaxugetafajisajifogo.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/70411379813.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/af166a21e93d0cdf27361abe337da61c/38015650196.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372de3de75b---95311748058.pdfIn PDF document text
    • https://asiapharma.la/files/files/moramumijivadiragojosagi.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/kokodalizatafewojuzu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/rubajuvuzugojitedevimib.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/perimidivemotef.pdfIn PDF document text
    • http://erdbau-rauch.at/8712495670.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/towodafuxopubizidimoxipo.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bexitubop.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zivilujom.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/578def2d9575f75d68fa53631aa12139/71426420544.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/jewigazinafilixe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5arvshd17613cn6c3u685sv676/18770369620.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6aed3698---gepamelijutazalas.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kozame.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wasupibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=they+say+i+say+2nd+edition+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_off0000d0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 10780 bytes
SHA-256: 66cee8ceb2ea671242c17f9a4a061ad9da149d53bf39fe1cda9cc0bbbfeb8acd
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 17364 bytes
SHA-256: bb5563f536d5da8206d3c6f4e3c262aaf5fa3e55c75b3df7991cac897d4ed1d1
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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