Malicious PDF — malware analysis report

Static analysis result for SHA-256 da90ad5d18e32068…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 05:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5563611891271e36c63cd97253308d07 SHA-1: 16b4079f298baab3a28794a87e0f51362301aa0b SHA-256: da90ad5d18e32068f91f71b3584ee21574d97e694f71a9c5565c1a9ac99e746e
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ML classifier strongly indicates maliciousness, and the presence of compromised CMS upload links further supports this assessment. No scripts were extracted, but the primary attack pattern involves luring users through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=mifid+ii+rts+6+pdf PDF link annotation
    • https://swift-tw.com/lcc/upload/files/71600459347.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caed00e6415---kinamizozezogil.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3285937dba924f94230a098bd5fdab67/32342046450.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c7d5de2a---vakegomo.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/vexuwuzezokipafo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///pajugibegal.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8iq1fc3rhcivc7a397j1rb1lci/gonimijusojomijofitiz.pdfIn PDF document text
    • http://tochalco.com/uploads/files/loxinorutelib.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/rinuxemuxenutevuxubipov.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115366e535f3---14771941784.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/405cd4d8b9cbfef9eafdf807a3992390/medavibuke.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/192dbe3985e35890fd626ba7a29389f2/dolazalonisusola.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160991d1d9633b---zogimisuroselizeked.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/eb2a33b71c9ee4c6c58e12c1aae0e986/vodazefukokuxamuw.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/kininafolixunoxis.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7bc52a32b5cf5113caf38b8433ad6a32/minukugoxafubidefapugaba.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/19068402143.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/67800738193.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134091fe9b46---5891827764.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/31160557451.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/17041657406.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/rexadawoseru.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e11a7d4aeaf2c83423a180ecd3774cd0/lanekawonegumigal.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/20560039386.pdfIn PDF document text
    • 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 16556 bytes
SHA-256: 2979de702b1efe364a3bd2a01a6f848137f752c7c592a68fc901c4885f45defc
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 10088 bytes
SHA-256: a2d848a649bece33734dafbe5e5c9d42c7c4fbbf980dd64679533972c36c2d71

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