Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c7e723cb2a2f26…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 13:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99f886706124f77427c9714a12001ac0 SHA-1: 0ed2903c5914122aaa2183664bf55fc40714cea6 SHA-256: 66c7e723cb2a2f26ec659ea6c9c5a9fa830093b5a0a1688c4551c749edef09f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/7jf30ercttcstmrd7i5e3ko3gm/buzawifamavukapamopud.pdf In PDF document text
    • https://krono-original.vn/Images_upload/files/91019398554.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61d3eca26---wawelapumutupegubosem.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/nulasulopelelogopemep.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/wetine.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8a268097aa070bdfab2426059c394b0a/mexotinupiluzegexo.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/jevegikidezusulivig.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/95009629710.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb1868e61d---33960444366.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dkecn5au2gdodqa3eephcca2a3/jojixaxopesumel.pdfIn PDF document text
    • http://artepcb.com/upload/files/10495006935.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voluvawakenav.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f2602472---wukumowuxilan.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a278c7459e9---girudaveb.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/5653738420.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/9733987394.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4c256a574f5a47725d1c70d06fe413fa/daresosatilafusure.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/26818571868.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/koveg.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/51e2b46923d046c65683ec5b868ef4eb/88088506169.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/vunenisipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=high+protein+1300+calorie+meal+planPDF 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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 10988 bytes
SHA-256: e8a2e76ee152a0ef5843ef653bdc2b8ba8f0d1ad33e1c0db72b5527baa193c01
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 16668 bytes
SHA-256: f983538d1f6c61671bcde86037c2ce7de3eba7f64d420fd47d31397300fdefb3

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