Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75f8c42101e154f…

MALICIOUS

PDF

82.7 KB Created: 2021-08-20 09:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae174d5c8ee70e8f1a0d1e5c23606817 SHA-1: e283386089b8a68e575ccd786f081446119a4440 SHA-256: e75f8c42101e154f70abf47b759b6cfee957ab84dcb6eda265d49e60a77c08ee
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or redirection mechanism. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=how+to+turn+off+keyboard+light+on+hp+elitebook+840+g4 PDF link annotation
    • http://china-zzld.com/uploadfile/file///2021060412423749.pdfIn PDF document text
    • https://aokman-drive.com/d/files/gigufipukujobivisu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/xudejofujovodomopufebago.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/da56e31240fae72939be4b32dcd7f2c4/taxefija.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90aog1llo64c1mj5v089l5o6l6/fafawopitowupaju.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xivunugidexisetaf.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/poe4kl7s1q5qstst701jm8vpp2/petavipadobuja.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/visogorakujesu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4an67ugko5h26plq1fnmndu476/balopazususoxisi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/62809558845.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/bodolemigavemibilojug.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rubonipubogidi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39720e7beb---ritudesisagitip.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/34604766248.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f817aa99f---47662088865.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/g7ijofhapba7vuo593vnu9h8dc/84057292094.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd6d41f23---6591111997.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210710_085429.pdfIn PDF document text
    • http://focostrade.com/files/20210612072551.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c313db23185---kevajomasasubitane.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15c041cd3---43753686366.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/xewenufifawureporutuxela.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/zitediku.pdfIn PDF document text
    • 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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 11540 bytes
SHA-256: 3c6f446cfc0d2f789d3202b8acf6df7cc22febcf8ef2b542c46e62689251400e
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 17276 bytes
SHA-256: b68385adb6356e3cfe2dad6e2d3ea71329b9a4a4c9b40f93367d88e39a2a872a

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