Malicious PDF — malware analysis report

Static analysis result for SHA-256 93035f442b685cfb…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 16:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f899aad026190571d154b407c6f6cb1 SHA-1: f602164ce0f9f2a854f22e07ba40c7dfc713c641 SHA-256: 93035f442b685cfb809e3c027fbb435b7dfd546f281bcaf76c3164b38f1529f3
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9366

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://motorlustor.net/userfiles/file/wumisaviluredixujig.pdf In PDF document text
    • https://losungversorger.com/product/file/vuworujufiwosetotofav.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/rezabijasebo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161397f96434f8---veleguleteda.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///48961856748.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/74887901420.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zumasadakisanidad.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/niwozelusevizawewoguteve.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/jamaropodukurujomawezomut.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/78748102776.pdfIn PDF document text
    • http://domainecomps.com/documents/files/51409227720.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/pekulajuvobebine.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/75465628174.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/m86ihfgmd5cpmqrkot3nis8bnq/zizigofivaz.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/babisubetezukux.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/tawalujebapananeteworub.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/lamawimavasone.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/51776727461.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/73846901250.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/zinixopofezujifipiwemek.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/rebukavegobodixojudupa.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/24287990107.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8a3f3a9e---66827505145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=red+fox+life+cycle+diagramPDF link annotation
    • 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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 18604 bytes
SHA-256: b85577bfb4f7db5e5ba29509aa23c13155b38f529e24992f1890032f2588b87b
font_01_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8F 10712 bytes
SHA-256: 2cd3213d5a7cde2fdfa3a9e0670776ca67887e3077d43a49103c91e0755f6acc

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