Malicious PDF — malware analysis report

Static analysis result for SHA-256 4970dad0f43fbb6b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-08 07:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7c089794ed2684d53c3615128aa5122 SHA-1: 65ca81e18c2c5ef74dbf9f0ec50564dfbc503024 SHA-256: 4970dad0f43fbb6bac238b0c690498a53c2f18715174cc16445ff512b597d8c9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or to download further malware. The presence of numerous external URIs and links to compromised CMS uploads supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=carta+de+los+reyes+magos+para+imprimir+y+colorear+pdf PDF link annotation
    • http://englandmatchshirts.com/assets/file/41784736676.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/88927558920.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/fugafidevufowipajeribut.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7604cdee1a5de14ed309d5445f4c3588/lepododilu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/manabiputodazobop.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aaoa075fodtrjk3qca1d2sbd7u/puseletagusalet.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846766999d1---43854430194.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/67679860050.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6b58c28d6422b735c72e5351dcf13879/5898764619.pdfIn PDF document text
    • http://rykatd.com/files/fariwolap.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cd45953073683a5507fb2814bff07f31/27502717718.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16105e1b5da49e---difugodomiwutalefukede.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/numuw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/398e1b1242c397523fafebf49c761e25/2144153424.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/boliboperoganokofope.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/timete.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d657e2d0d---1316586813.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b78140cb7aea176317e46201eb4b3671/79605056509.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc081a6aa---66539673011.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5s47l6jcfj0fg7k4a3qtq7nr60/19806672107.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/goroli.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/xikamujijokosinamelex.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825907ecb31---53084242744.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 11004 bytes
SHA-256: b9739ee3b13dc630153483d5c4916825d7b6149bb1ee452dbaee72490857e3b8
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 17232 bytes
SHA-256: 08eea332d5c81316beeb9ce9df956edf0660473794f4ba382995fe8964565814
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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