Malicious PDF — malware analysis report

Static analysis result for SHA-256 0baa8f8c49e79518…

MALICIOUS

PDF

98.5 KB Created: 2021-09-19 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6b9d58e9df705a75e1677748c6c5285 SHA-1: 53781ebc66b743405617c594526c32cac4609919 SHA-256: 0baa8f8c49e79518eca12c7c797aa6aa27352852d34ff64b94b7ab3c50e10ddb
64 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised WordPress upload storage. The primary purpose appears to be directing users to external content, potentially for SEO poisoning or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.1206

Heuristics 4

  • 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
  • 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://minlinart.com/archive/upload/files/zubibumirabevifadob.pdf In PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/jedugawekit.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385667e215---rabududimu.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/87247360755.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210918101331.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/33638065320.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/92143038342.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/25153462828.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/21971245659.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090710471699.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/35307881242.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/90118764641.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11868a6bf1d0728485f63455c2628a6f/39246451432.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613249e0f04d3---ludipebinefaxenazate.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/giwumobexekaki.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/rafovipuletawiwixu.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/fofevixalabizaride.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ae2a59610af79a18f733b006dbd5abcf/18724379148.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210910175847_1367301386.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/gixovunivufumidenudel.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210910052003.pdfIn PDF document text
    • http://mousike.it/img_ins/files/gemufodanaligopukoxobu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/guvakasel.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/bizepovarafadirezuza.pdfIn PDF document text
    • https://cncunse.com/d/files/puduvulub.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/najerezerixagewovigebok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=date+a+live+spirit+pledge+iosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 2652 bytes
SHA-256: a633c05a5def1492aa36d0357fb9c9bba7ce38b0974b16701d870e190fb76c14
font_01_sfnt_off0001451e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451E 24264 bytes
SHA-256: ef4558cf7c3d4855d87df0dcd2cfcd68bb8719d465156d370d197f43bd5dd176

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