Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d5f93a23ce14cb…

MALICIOUS

PDF

81.0 KB Created: 2021-08-30 04:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc33e043c2f8b8a63c7b7359aba8adf0 SHA-1: d038623e3832c6b900842200a9176d92abcfc28c SHA-256: 09d5f93a23ce14cbb665a6b2b53185a30b7642b7e372d9319b4e090ac19ccfcd
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness. The primary purpose appears to be redirecting users to potentially malicious or phishing content, leveraging a compromised CMS upload as part of the distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd895c97226---sixuwatevadedolopubulejif.pdf In PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/11658788422.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/womedararopopoverinid.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/susenefisapaz.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b9b42052820c547a92c20c2f145f7a98/15656586194.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k50gir1uncel04b0sq7d6frnb2/bulelejomimewagu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/91ca32b243ccf6304ac26ce76f0428e8/vabilafaluvekupux.pdfIn PDF document text
    • http://canadanur.com/resimler/files/digokofolirozekige.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4p8dkm8aclcjt0sa6s37e5qrgl/65491321373.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/doserojojapexonipilo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/v8h2vh4rpkpojcl9bltp0bh91q/rirituw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f691823a11---20387842412.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5121150055cd596961ff4d9383d201c7/nodax.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48955da4f4---bagefabijo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/wajoranoxeleweduzimen.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa68cd9a2---93206897415.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c506369ba705dc336df8bad2e2cce123/xixasasorinuwagugidezewaj.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dbd8e6325b84bcdd42af25b3e8d84586/67892673044.pdfIn PDF document text
    • http://proxima-design.cz/files/file/buzezetovol.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b898b222fcd---1778912155.pdfIn PDF document text
    • https://palet-school.com/files/files/kemokabopumupuvezes.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/44049357345.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0e67ceae---nibiwovetulejiwaleforuvik.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074653939fa2---69344983490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=meaning+for+decentPDF 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 10432 bytes
SHA-256: 083c6ac98a8ade102b6355c1fda5097565f7362f112f2f9f7b94ecf72334f4bd
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 19504 bytes
SHA-256: 0a318235653bdb94b2abd7735e23ebef218a439513bf95d9a4af1315081ddac1
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1