Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ab355e11d25d85…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab37229b4a74092b17935425ee49b262 SHA-1: cae0e0671261dce8e8fa9488d8f6c3311b323090 SHA-256: 93ab355e11d25d85a72074f94f4520cb02c2c30e20b1a851edf3da1de30d0a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting suggests an attempt to obscure the final destination, likely a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf16f46f9e---birixujugulokesitilujevo.pdf In PDF document text
    • http://kids-ex.com/52151118184.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/988ab78e3e6645e12f4766281a139f59/88661153698.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/bopolubojosola.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608579f55be2f---73120948203.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11b913238---sonud.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jaber.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fanivevibanuver.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/90831110141.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/xedofavozajijonojubalut.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4fcd58347329e5d7c7690f0afcf4b0dd/pezaxudubuvema.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/97840180391.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/msqdouqgj7nvglpq1e752bpcc0/14301266698.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/runogireluwimatarumad.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tetovupiku.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/55330201379.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/kazibupez.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/zapipelajameru.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a144ec726a---womuwepitegeji.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6f674aba996afb89a37691ddbafe0ca3/gebovimeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=el+cuerpo+sutil+cyndi+dale+pdfPDF 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_off0000bcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC1 10812 bytes
SHA-256: 28e4110fc21c529572efabb505925390011e2625ec677aa1c6551f780e3521e5
font_01_sfnt_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 18580 bytes
SHA-256: 19902e4e2cf51dadbe511b0157d99b5cf0ed9077bcdb3ecc717896a0d0816c55