Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62e6767e7ed820e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-09 10:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a066d8c0b24c0dfccba1a511ce0b8760 SHA-1: 373dc8b350b2af74d02f31e2478e5d005b881f75 SHA-256: c62e6767e7ed820e5afc76ba09d6d460a2b76e69da3ddda4a2ced3ad37296a2b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF's structure and the presence of external URIs point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42170d70bc---lazetesanekidabaj.pdf In PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/36845619871.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210703_195607.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe915c107d---molagi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pewafeladaguzabu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3420443da1---lawafezi.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/jaguzipizisufawewefe.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/73460894808.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/guwizapisikori.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dakix.pdfIn PDF document text
    • http://computerdoki.hu/user/file/fopesifudet.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/32900107266.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738ae375b9---wigikaxirovemaxori.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/6389679955.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/921np6csjqu6jva0enp6ggsoiv/43163360475.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/tatuxatipaxisadajezasif.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c864c54600---89068961471.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/30628489601.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/nezez.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a8886dfe6671a52486fd1df6e6c9f3c7/luwizugilazik.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/bulilidu.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/kufapowuruwof.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6nekt1a31palidmqfkn5oeveq5/16976872362.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/fugajetivot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=have+trouble+sleepingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 16828 bytes
SHA-256: 5cda210d21a7ddc31cf25263b59133cd2426b6a33ecf0fd5e110bceb8ecf9cc0
font_01_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 10724 bytes
SHA-256: 3185ca33c0cc984263674adddc2f51839bf5e0bdad946b9835c35dc8fbc1fb9f
font_02_sfnt_off000138b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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