Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8480338e5eff6df…

MALICIOUS

PDF

70.8 KB Created: 2021-10-12 04:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 762e8d61fa99e400e3b710a6a8a67824 SHA-1: 94ea38f7eb4a0580508dbf40cda0090d68626f3f SHA-256: e8480338e5eff6df59a6840040df78e862443618b04c3b9c05f6b343f136fb7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cgl.lu/userfiles/files/47208131002.pdf In PDF document text
    • http://guoyangmoju.com/userfiles/files/43337454344.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/degitusixekivasekezokib.pdfIn PDF document text
    • https://gemwares.iceleajewel.com/userfiles/file/30644227024.pdfIn PDF document text
    • http://schubert-hh.de/image/file/seliwerazuwajevuwune.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/nalewogixo.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/26675454416.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/60635435659.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/6923159802.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/wogipakomefemepipinipuwip.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161589f0f02499---kitapugu.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906202152.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/66195088135.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/58844743185.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b9a5f346a9f76ddd555e175f6720389d/56353393824.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/bexetazazarulok.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/banudonujopuxamomijusuxe.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/24159014945.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9r472tg009ru9kh75v4e04gs05/fexixejorosakovatole.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sitirax.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ace5d6fe---gatovatagop.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/67947969031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=red+dye+and+adhdPDF 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_off0000b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 9880 bytes
SHA-256: 80e36c4d0162855a1edf65414f767b1d09fc335d6adc74f9dee98723c42cd5c8
font_02_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16980 bytes
SHA-256: c957d195595e5b923e565e19acb204bd1c20d3e9368a2cb267ca3a9f4f03a705

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