Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8c4262f2ce119d…

MALICIOUS

PDF

92.9 KB Created: 2021-07-18 02:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2114da162ff23a11d2824d2d160f1775 SHA-1: c8f1a5f7cd8f23be347ea49de65752080743d899 SHA-256: ee8c4262f2ce119d26eb8bad7ec96df216ca393ec91e8ed97dde4aaf7ffebbc3
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm hosted on compromised WordPress sites, likely intended to trick users into downloading a secondary payload. The presence of multiple links to files within 'formcraft' or 'super-forms' upload directories across various domains suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d901b2bfbd---63298395662.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa279292474---24513284142.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/dcc0f75c499cfa376273387153dce1c6/32255592718.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752845d419---17230137554.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/30e1131347c519b49fde1f46e4ac3f76/52317129007.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/90345363254.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f34a8be84f7---bunawovugejazafu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/95bdce0e92475df374e24847c9194643/27943667542.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/94756102279.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db87f79daee0c906e9dd3d22bba0eda/mabigelazelagenomosoz.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/11089301326.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e888e88b---55536266295.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/44811432515.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5622fef4b2e8ccfd1d8c4f08bcff2740/nefaluwanipokekomito.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/dea74c60abb918fe5f70464d77d21329/nujoxifativujefemete.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7lgepk0fe6dfbj082nk16sm75u/34344643953.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d0a5219d---mevivuboliridusofetesug.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/85480070159.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79ec70d9b---7252335422.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770690b9779---gosajaniwaguno.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/2543356974.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/75826474066.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c320424017573be357d37351c9df938d/36708077472.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/lobasaxabugonorumarifok.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/fokakufazobokefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=snmp+mib+browser+onlinePDF 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_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 17688 bytes
SHA-256: 14d73032cf1c1300d709b6fc42d5357a521c6ca8ff1b260f62e96146345b47a6
font_02_sfnt_off00014eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEE 10456 bytes
SHA-256: cdb09411d85e86a641156b12aecdd75ddf0142befacce7e9f9b9bc00e5621997

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