Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd36f6e3ba20b4cf…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 10:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59afe01863755ae88d3e987ca61022ee SHA-1: d1b7fe1911e517ab001f335285f20524948f8469 SHA-256: dd36f6e3ba20b4cfbbb3638600ec709a28dbd3ed7914a20d6c27b083d14d925a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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 https://krisoc.ru/uplcv?utm_term=jump+force+ppsspp+highly+compressed+download PDF link annotation
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f371lphma84oeqg2skn32cqcje/dumuxekefakatotuxunel.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/81925236791.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/nuzulimo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729c6bf1bd---fudan.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kuzajulasagovoxe.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/boxapa.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/sikime.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161305eb4f27fa---48195657510.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/36002761190.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/85876178136.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5fc33e8a2---vomob.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/93728790127.pdfIn PDF document text
    • http://lagrupacio.cat/file/10066234600.pdfIn PDF document text
    • http://watch62.ru/files/files/7468540018.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/dovokumivibubi.pdfIn PDF document text
    • http://packamate.com/userfiles/78057362712.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zixorada.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/pupekufidano.pdfIn PDF document text
    • http://leeandrewdavison.com/download/takubonodaluwunixal.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/11f9eb8fb113990a1c05b070f6187d14/68100413893.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0cdc8c962---66148116441.pdfIn PDF document text
    • http://axwelindia.com/uploads/juzexetizeropezudad.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_051269673D293BC6.pdfIn PDF document text
    • 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 11260 bytes
SHA-256: 4930a161bba1d8dab1d07d11384f3adcbd2403c29f5842e16a3817fd0add1c67
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 17052 bytes
SHA-256: 52b4136652145184c6edfb7fa4cc4318f3c21220ae980f213eab1b847b911fd2

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