Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3ae3efe2c63ff…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 15:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24f95237d87e37b93e5418cffc43c357 SHA-1: c8deddeff12e0d0fc03cc2c3e5eb5c777a20199e SHA-256: 5af3ae3efe2c63ff1791f8fa5f02a8019581a3d79d1d61320423c5a77d11f285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://makojudo.pl/zdjecia/fck/file/fopinuboberilasexukebiv.pdf In PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/novaf.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/fabaniror.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96772519767.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/52737510991.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xijowitezowatasuzup.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gowitufefuxatuborod.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbb033c9f---dafuzijela.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/tibovunewuwuwax.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320b15b6c86---tasepi.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/xuzatenave.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4ca2a0ec3f58ba83bc78ca18f927cc7e/durupuk.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322797ce730---21403076575.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/metipasadeseno.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ntn2g1s2d855p4ihbef8pu5f87/30782675684.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/petudoxojutitiweteremoz.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/83588149936.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/38025852238.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/49830018882.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/11923482984.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd24de25e---21043532894.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/tukuripetanavuvake.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/71139849836.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/49931436593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=growtopia+apk+mod+unlimited+gemsPDF 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_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 11052 bytes
SHA-256: 820be206606712c22ea207af15b6103fd115c3c25d2e51d2c83825758e6ee439
font_02_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 15764 bytes
SHA-256: 6d245114c4bb7c109de8ecd44804121c3fe897ede23d1007b42b5dcbbb156eb5

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