Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba056105ea501ba0…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 03:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6f095b419865d778595c11dc1a4f7377 SHA-1: ce0ed7bf8b7622309895759a1110cb044de7d38c SHA-256: ba056105ea501ba05835bdc123ce40acdc49cb6a07a41e77969bc51af82aef29
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories. The ML classifier strongly indicates maliciousness. The sample's purpose appears to be directing users to potentially malicious content or phishing sites through these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://poolpoint.be/uploads/file/24285632007.pdf In PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7uo8ebptqnv2trr497cjfmgg85/pasome.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3c2cba7d25e6a3b0ddb7e79bf492660d/vexiritufuranu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503005133614742.pdfIn PDF document text
    • https://alutat.com/data/file/8084768371.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/41715445728.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/27272f8fe3cc627e3c02859afddd2c9b/53163203909.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4cc212af902405fa250fe46733d50568/rotezuvejidubunenel.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b15ed37edd---56600293513.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ef7ae337---93994743345.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529081949.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41c62cd0d16e03958eb95e9112a582ed/widevabekuzipadonofonowus.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76213565673.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2b83e241d---60026217507.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fegenabekasijugifoj.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tuhs0kof3o5obbc3h1qna6fs27/vupitejemutel.pdfIn PDF document text
    • http://erex.hu/upload/file/dapilotebazebewola.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/99266776607.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/nubez.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c680524f4e---63747580329.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/bijajome.pdfIn PDF document text
    • http://akademibt.com/resimler/files/80056927492.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qb756qf3bqgfe7crhlc3boc4c5/lusafolup.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/nebusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=marketable+securities+meaningPDF 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_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 10776 bytes
SHA-256: 920a0ba77ef8f1c4f4dc46d09b00d46338828ba1bdc967665225765f4562e89a
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16352 bytes
SHA-256: a1ca7ae800ee8e4bb48a211b3b8748f4f6c274ed7f3b0a4e31eba216292ea79a
font_02_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1