Malicious PDF — malware analysis report

Static analysis result for SHA-256 f586e3e55fadee0a…

MALICIOUS

PDF

84.9 KB Created: 2021-10-10 21:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c98b4c79ae284256bef4df5823a028d SHA-1: 47c013c8266ea957bb86998ff9279224f6016bc1 SHA-256: f586e3e55fadee0a5f5d7dc4c0d9c3e293e93a5d9e1d6a11b793de0b0497cb6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, indicating an attempt to redirect users to malicious content. The primary attack pattern observed is the use of external links within the PDF to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=church+of+the+most+holy+trinity
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161381b3c6849c---30310935937.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/raxinizov.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/fegizobexezenezew.pdf
    • http://mmsmarin.com/imgimage/file/89037847793.pdf
    • https://egyptsuntours.com/userfiles/files/58984912539.pdf
    • http://cdkuys.handysociality.com/upload/files/motifobijavefaxepi.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/kofinolimonubuwabok.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/komolak.pdf
    • http://pusheng168.com/uploadfiles/20210923035644.pdf
    • http://vucert.vn/uploads/files/rolobubilaraleweb.pdf
    • http://123podkrovie.sk/editor_uploads/files/42792215635.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/672196085d1517698ac725e8fbc17fa1/11672312702.pdf
    • https://ceylinpin.com/calisma2/files/uploads/31244123033.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf855c75a0---bipogim.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e252f41052---17513199593.pdf
    • http://vuoncotichdep.com/upload/files/mixuvawotibilubewekow.pdf
    • http://bakoca.hu/files/file/muxuxorisirokubokul.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/81790399791.pdf
    • http://villkasz.hu/editor_up/fisozenipirapidokego.pdf
    • https://sproname.com/files/userfiles/files/25671222046.pdf
    • https://ctcitsupport.com/media/files/fotubudaxopimivuduwex.pdf
    • http://jjburgerut.com/uploads/files/torivofalonapu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 16792 bytes
font_01_sfnt_off0000f86e.bin
d11dcd0506e3b8665399968b710ebc30d33ea0c2dd752b7c7c9d328c3e25238c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 20864 bytes
font_02_sfnt_off00012e38.bin
9561d11844d3864efeb6448302158362bd4326ea7e1a0a66767208023a65a1f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 10684 bytes

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