Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf5f1a405f26f75…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 23:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03bab8e63a16702894b1ccb3f32551f9 SHA-1: b6d1d9f500222c39f33b8a98cd227bf10445dafa SHA-256: 2bf5f1a405f26f75e0c1478bf20bbeac6f7dc236c74fab1d232822eec52be500
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://altaprecision.com/userfiles/file/54104537054.pdf In PDF document text
    • http://starsunited.at/upload/files/wegevekudoxiliga.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c8e31cd35---83414782264.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/wumijisariraze.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/70438137509.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd6d07b02---4862543967.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/84266be0cf7717a8d8383f160fc74f6e/xuwanogarog.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9db848fbf2638efb77905c187637f07f/rabibodogeje.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/19523358834.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/9370634015.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/57037491543.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/57460927005.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48da049a9---75039829018.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d723b20f139---71555951076.pdfIn PDF document text
    • http://qca.ch/userfiles/file/79084417174.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/86585018293.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/22521521140.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/69903493841.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/gexabavixexolopezajufujez.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b756f242c---9796417488.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/23708063263.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d7760c8f---13719356810.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/41144892940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manual+de+colorimetria+del+cabello+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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 19288 bytes
SHA-256: b8536c3be63d30cb13a839463885137533b582d0077037b56b6e86ed3767f617
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10848 bytes
SHA-256: 6bbd6332e7b5ef19d1890e7a8cad68f9e02c55bc95b872cc769766a622b6cc0f
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1