Malicious PDF — malware analysis report

Static analysis result for SHA-256 99372ec062bcdf13…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 14:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 451f202ec6359753806b0f22d88e90fa SHA-1: 1f279d489bf1ec964e276429479bfcf4e468b284 SHA-256: 99372ec062bcdf135310ed78c2304fbb10e22323083644f9a769122c3fa3c3d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised or disposable domains. The presence of numerous embedded URLs, including those pointing to potentially malicious content, strongly suggests an intent to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j6och6bqog0c6k0phl5fi9iei1/47786372519.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e3c32b25bdf48b1e01d9bfd85cd870df/36726526830.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/fimutetadovevolaxawuj.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/34852885500.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/pusikuranopojeritomok.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/rodedozuwetudixitoxi.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/levejoxovuparizuw.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/fopukonam.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34083177089.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/vevolaxusagapu.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-12/2b6ba8abcd7d59bf24bfa199867b9635.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/69045076818.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/guxebixefonafujoxi.pdfIn PDF document text
    • https://eslms.com/userfiles/file/60114068443.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/93655798684.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210906_232848.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/39911267255.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/palevowixatomudubima.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/500e05e5fd32c29c7887773a6ff529d5/vatapujojegomonogodanogi.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/dowitilokizogigulusit.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/58782503321.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/36346984906.pdfIn PDF document text
    • http://moneymaker-gold.de/files/14599811.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/57167475899.pdfIn PDF document text
    • http://villkasz.hu/editor_up/vixosukuvokamak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=estrategias+para+aprender+a+aprender+segunda+edicion+pdfPDF 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_off0000bae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE1 18152 bytes
SHA-256: 616b88345b0bc427c4db0a97ee4de01b1312eee0007a7d2de8cefe62382c6496
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 10832 bytes
SHA-256: 84242c2c6a938ddc7309f7d88afe99e811fe26498ed35e939e330c80d665c570
font_02_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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