Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b12fa779c36db0…

MALICIOUS

PDF

70.3 KB Created: 2021-08-16 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c7ead003979aafd95d0c7904c547e41 SHA-1: 0e7b9983d1dfff46be2f761682c661d4b68f8cc2 SHA-256: f4b12fa779c36db0d6b9755c12ca71bc15f18ae8201e643b37145a6ef1ca4e46
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious or compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9321

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/pebenov.pdf In PDF document text
    • http://wksx.top/images/userfiles/file/90566557311.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/ferufimejizuxosani.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/31400069303.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/87959259914.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd030b316---mosedamogelinabakov.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/27986939651.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdff5be0fd---zaguzotunesixosanipawebuz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/60567184227.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/88603936966.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/madofipesofefiwebowebefet.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zatonevusukomedikasef.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4699e106---nofutunexumilajip.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7d3f506c8---vidofipegudilorazutawe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2755c81b5fe9374fd678df04f73e50a3/puwowibesofalupizofu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c6cec08c74958f4c8dc5c4b93f3b778d/80935201974.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a176262a---86733711684.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bd0c2185---29498105387.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070077f9e0dc---lokumarejigutapezuvip.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207534ef64---pisefabujifawomiriw.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///milewaxudadamijamudipabal.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608726c2a363d---botifupafixebumizaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=anet+a8+plus+skynet+firmwarePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 17448 bytes
SHA-256: 0f2033521719f031886040346d114e45498d10b054faf747362d6dc616f6ac05

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