Malicious PDF — malware analysis report

Static analysis result for SHA-256 5503a5424b3797c9…

MALICIOUS

PDF

90.8 KB Created: 2021-07-01 20:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5664bab9fb408ca2a0934ec4c092197a SHA-1: a37e15bf71521c1a2b25d86eee73983f5feb0f1e SHA-256: 5503a5424b3797c988877586da74753870010a30ba9715fc14b0dd712ee22d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to redirect users to phishing or malware distribution pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f90776e6---60436905843.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a41efeba4e1---zegemifolixaluwu.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ccbb1992031e3d3f289d94604ca08642/75501796597.pdf
    • http://asbazainville.org/userfiles/file/3500304737.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oi3tci41qfhuqek3k1rmrf0bq1/92278138375.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0db87c077042ae6fb0b2276c90439542/puledorexi.pdf
    • https://kede.org/userfiles/file/95305289337.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bakole.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/acbeeb8cf7f686d846289790e9b3593d/daxafufi.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d89b3ac3---nivukolulaganiranefenus.pdf
    • http://zabradli-znerezu.cz/userfiles/file/91690305932.pdf
    • https://shellserva.nl/docs/Image/file/xixoguvoposadupu.pdf
    • https://bitree.ru/ckfinder/userfiles/files/romufiwakirawigumoveb.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3648022046---48987621709.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/82b741995aac771bb526559329c26a8d/vajasusavozixuzasiwe.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecedf09ab---masobemazitowidopusokun.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/1213636526.pdf
    • http://bensonlandscape.com/editorData/file/31022740622.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fc1b848925bf6accc480b3de519d07fe/tejotajopaxureka.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095e0908cf---runov.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c14be7f6---bokozomeg.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d112959b9a1d008ba6d19ecb549c9217/bijabutekar.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/1ouecbtav1e0hf3dghmbr5spt7/somugefovuvotuz.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/porl3nb1a772s0r17qvkvi8ob7/luvisabeg.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca1hfdknd58qopkjia1p8t28ru/92001014984.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=easy+scallops+and+pasta
    • 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_off0000ff3c.bin
110aeefb14b5c21035c7764dfd099f86c03d9fe0bbe2cdf1a64ae3bdefa66ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 10280 bytes
font_01_sfnt_off00011694.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 16792 bytes
font_02_sfnt_off00012ea6.bin
eee9707c46b13af7cf4742193d865219eb05f2c880aebf875895f88a037394ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 17556 bytes

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