Malicious PDF — malware analysis report

Static analysis result for SHA-256 1435917c00efefd9…

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 10:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccc1a2f91a7c888c7501372df0cb3356 SHA-1: 2169bd67f68fb74e5e874d99c69299594a523bcd SHA-256: 1435917c00efefd9173bbae9defe2a807dd012a1937a702d7e21d435e9f28cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many distinct hosts and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs point to compromised WordPress upload storage and other unknown domains, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pezenasenchantee.fr/userfiles/file/vufasaxeje.pdf In PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/kararaduzofalusesedi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/nibuwofonitutatabadadi.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/43200353813.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349848252b---dixejerumisomaxotiguwuki.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34366753261.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/gufowuvagawowim.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9c7a05c6---juzufojotof.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/72511061706.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/parepowirakekepemafado.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0cb34d8c---mivoxufejonafuvuka.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/visikarosekep.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8b76541ea9de019466eccfd31755f616/93053915940.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/20260982042.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/bufepezuwawaluxorilegi.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/biropabubanalawara.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/73314673703.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139c35a101b6---48777359653.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/4233300775.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zitizuzubilon.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/18511384787.pdfIn PDF document text
    • https://wasael.com/userfiles/file/83413676348.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/6785891095.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/60803263913.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/bifigigim.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/87536467105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+mobile+low+price+in+pakistanPDF 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_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 11036 bytes
SHA-256: 8ddde2d46c3ac5e126cf6d366da2d7cbe7893a294015b351d214d94b301519be
font_02_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 18344 bytes
SHA-256: 66c41601ebe3be9eb363a0f0799f4d972876575dbca857d268be1cf43f0c4bf1

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