Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2f5a6c2ce8fe27…

MALICIOUS

PDF

94.4 KB Created: 2021-08-13 17:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 317b94b8ddd98adc5cb54c35b9512a23 SHA-1: 3e4766cd6199b5d5f6f6c0cd7705e4197b5fffd8 SHA-256: 7a2f5a6c2ce8fe27028a09922c934dc2255bd0b37f5482bd612a4140bb12933c
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://ukmriptek.org/codeIgniter-hmvc/userfiles/files/82250374955.pdf In PDF document text
    • http://daebokjungdb.com/uploads/files/pegazabewodikiwaboxapavem.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vq8r231tt4j4k57819rloncmq6/57373513197.pdfIn PDF document text
    • http://expresskaliski.info/file/29647098280.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/wujebizobir.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5437675e37c89f64e2f22ed246f2f0f0/16629091592.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6fde7935a---10160441682.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/logelukutal.pdfIn PDF document text
    • https://ubranni.com/uploader/files/97269627036.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/jedejuvumilovetidajadem.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e5a7d38064467f30e864bca0af2580ac/lovekaxutipasoriwateraz.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/mifuruzat.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b48cf1ee6---tefog.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608365f95ed87---72764247208.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1626241948.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/nukutoxizukoxol.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5lbqo6hc3dg8qaaikcsbbiptv8/71142372533.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/kigenomem.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/jubabiwugofozukisiki.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf03b5a3b80---19332454304.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/77158771948.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6aada37a---21212285367.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/sedidovubabumanil.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lvnl2qo1cci3jbf6gcajdaod06/xexifetom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=shin+megami+tensei+gba+english+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10896 bytes
SHA-256: f3d7b90dedd213f058c42670306b59ac1a8fea06220fcf2df4a611151e067634
font_01_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 17680 bytes
SHA-256: f06e15375d937ccb6260d9b20b6b2640d887e375b5fab36b74116d91558f1992
font_02_sfnt_off00013db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB9 5048 bytes
SHA-256: 309f159ae08081742a14d268a743677b0052d4c563a9cd80d6e69d9a395cec3f
font_03_sfnt_off00015094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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