Malicious PDF — malware analysis report

Static analysis result for SHA-256 7319c9179b2c4453…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 05:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b74a9b707566928ea8f6f6b2ba1d559 SHA-1: 772c2669875f7ab89972e9f3b48ad2392ad6fd1f SHA-256: 7319c9179b2c44530349637c383d6a1c79ce18edf9f08825f636f31a26888bab
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external PDF documents hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 5

  • 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
  • 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://coil.hk/upload/files/81094410962.pdf In PDF document text
    • http://bronia.org/userfiles/file/pumireribufejus.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/58301151373.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kilejokugidobezukisarit.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/75550819358.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xemabideniso.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/86655203522.pdfIn PDF document text
    • http://epicridesnepal.com/files/muduzalamovomukogusofa.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/65282822971.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kalutenuxosodew.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110978e12a---wimojetubalakugori.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341df121e8d---rijudekopa.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/68996738005.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/37260662631.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/fiwipigux.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613968984d0e9---pewavolemibufobakelu.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/15176037191.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/befexiwuzi.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/dasojogupenekuk.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/99916883201.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7af577e9---53733979862.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210910003437.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/nisifogesevonalajimunite.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/72943314141.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/sedegajosob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jurassic+world+fallen+kingdom+movies123PDF link annotation
    • 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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 18212 bytes
SHA-256: 737f61faa7afc7433e055c4fe52ffda9fc20b05b0bfa123b5921ff74c22886fd
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11400 bytes
SHA-256: dc5e39242d7fdcb9c595b773160236f2f6c706a5629bc3bafb8d8e6dfa7d4c6c
font_02_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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