Malicious PDF — malware analysis report

Static analysis result for SHA-256 719f88581d88c4fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4628a5fa1177d9a70946409c38619033 SHA-1: 3547003d4f23bd806caf51ce357bfa0145ae60cb SHA-256: 719f88581d88c4fb3e0baf5455ba5d30b881942a6d5c18d537d642e6368c0918
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to websites, some of which are hosted on compromised CMS uploads. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9994aa4d5e---31344385646.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/mamonotavezifuvutoluzuzam.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/temof.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f12f6da2f4---xigusobefetuxowivesaruge.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/jetit.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb56629977---21166906724.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/ririropufevagoravasigoros.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/feril.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608168ad9e3ed---89394763216.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/78705125847.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fitijefuvoruwotelad.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076573f836b4---pivefososonaxi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ba610d14f08a2ce1ae243a23b17d74b9/xovavomesenim.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/vawepalojejisebike.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/73551805277.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/ketalagelemogoguladipot.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/52706972587.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/xejojixotewubagadufukafon.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd3271955---najatopenabakos.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/12302702879.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/ropaju.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13cda6fbc3---56854524657.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zolarulujavisag.pdfIn PDF document text
    • http://446888.top/userfiles/file/tuwotem.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f9c7b726b177a0ea91de1bb570f723ad/23751782067.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/86993542847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=worms+coming+out+of+anus+at+nightPDF 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_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 10700 bytes
SHA-256: 6f73e95449223532f1f900d4251dc208a0f1294b1b4089dcdc7b3a00c5013e88
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 16872 bytes
SHA-256: ff04fc86293eb36264ca029ed18f078cc7c826e940917459ee83640a344f9fa3
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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