Malicious PDF — malware analysis report

Static analysis result for SHA-256 c177ee1c9e51f95b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7091ad75d6f4573e2cbde762ff50160 SHA-1: fd66996137ecbea9ed8f423fcec9bc61387a928f SHA-256: c177ee1c9e51f95b3c0ba59c2e9f8b412c8caad6b722d0929e8939fea19b450b
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 websites or are part of a link farm designed to obscure the final destination. Heuristics indicate the presence of a link farm on disposable hosting and links pointing to compromised CMS uploads, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://streathamtaxi.com/survey/userfiles/files/4581194781.pdf In PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdfIn PDF document text
    • http://wych123.com/upload/files/lowaxesufadosopo.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/rixukulawujemoto.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea40f9dbfa---jejerukurutekejoja.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/20059680114.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/1789266102.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021962351592360.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb8cdc6fa---95021875320.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/dokitubuwuf.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/657521012.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xusiretosanomepobapi.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/88049276845.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/sarovo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b8f4ff31---30175898384.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/55369454797.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/96308249659.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/66074706179.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/peguxefasevobimedetep.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f678c696a9a83302dc215b8f73cd592e/vumapuvirasopitesiwivix.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/bolatutupafi.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/murerigupiluzur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hanuman+chalisa+in+kannada+with+meaning+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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 17200 bytes
SHA-256: 4039cb08eacc15f78fdbd0a4b4818b11dd9211edbdeb96cceb2589fa4f2f797f
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 11116 bytes
SHA-256: 9702af2ce8ca81eb9ef44434fea11e6a252398869d3ade6925667f96a45e9465

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