Malicious PDF — malware analysis report

Static analysis result for SHA-256 712f0eb12c6d8f83…

MALICIOUS

PDF

100.1 KB Created: 2021-09-01 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3f0c6a6521dd5a3bedd4afbb3320b10 SHA-1: 12aef0ce86ac8d5ac43915fa4d5a03d986a24c14 SHA-256: 712f0eb12c6d8f834a1b3825c13ad424eebc4438cdc6375a81a5b394197be3e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59dcd410d5---kubaduret.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d959226188a2997b5cf8b1e1f94a1017/44288612492.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/lagixitasop.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/zekomerinidowefala.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade4865897---sisudufepi.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/18497680758.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b159cb22d97ddf275e090c9736992af1/bazetiguri.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa8d52e5e---50720308154.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ef78d1d659d1dda9e13ef09116bdbeda/18417306904.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a8ac450517a3de25bf173b6ce7c728ca/96972015.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e2c0ad7e---48884513476.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/87018170277.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210630_5953FE33953FEE8E.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/fajamebigewajilubeme.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/86f5649b51c5107f25c58f87b3fef70f/vuxalozutepumazetiv.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/tarumaxaminepux.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nivujit.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/mofedamakenifinosepo.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/45177103790.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108250755526279.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b6717f3e---7337262387.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/63352368711.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/85706446463.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1a13e8d622d4c8568b8836a64b9e66ea/61801050796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=streaming+after+movie+2019PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/mofikuwuxe.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_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 10948 bytes
SHA-256: 609b770d05ac198fc6ffa5c1ad0c93f268dedea2ca054b2e7493d530257e3a83
font_02_sfnt_off000154e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E9 17720 bytes
SHA-256: 0b515fa36202b646419ba03b2d7db42e94bb4f7d8782a75d714a374649d487a6

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