Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20eb87abd008d6e…

MALICIOUS

PDF

101.5 KB Created: 2021-08-06 03:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 513667899a9c4f92da91d4c5444fc788 SHA-1: e907e4b83df9d1a31a2e9a7c55b4b6329c944b1c SHA-256: d20eb87abd008d6e9fea58094e0c92ea5165417932da8a52fe0a8104674d62ad
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content or further exploitation, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

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 https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/11078h5rb41ikcpiss8s7l8k4c/kavizexupujosowusef.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609005151f382---tumun.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/lepatixowesetidog.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/62907001988.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/80584157759.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/eccb7869c829eae9beb41a342b162c9e/teravaw.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759758cafe---12663663802.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00832345d6---58435353829.pdfIn PDF document text
    • https://shopabrang.com/images/files/lukowipo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/d5sr418u9ehfru8doanaqt2gah/kolimedot.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/14c9c6dfad297baf7689b1de5e1f0a4d/doxokukuxevixik.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/36761593507.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rb0ull17bs4aj0hso9uil2aas6/nefotigawuratedalorizun.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c727fe57107---32820280216.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/xumodokizikezuwuf.pdfIn PDF document text
    • https://strechybenesov.cz/content/vexusezutagugodepiga.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/n6uv9f6l54mhm93ltokbusdaic/79425920615.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7f9c6d0dacdf8539450d800063d8da65/63907014169.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gr1bduunorfe2l5eq88e5nm03n/banilogodugamivewebe.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee63dd0431---23278905636.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/figizoxakenasajeragisured.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/lasewakakad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+squarespace+templates+2019PDF 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_off00013208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 18016 bytes
SHA-256: 26c0eef803aaa3ff3547ca77bf24368901e897afb75cf1496a6c2f5f6062f4e0
font_02_sfnt_off0001792a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792A 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489