Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e357c808d948b7e…

MALICIOUS

PDF

73.1 KB Created: 2021-08-25 08:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea6f60db2d086cb01a4b52df82991382 SHA-1: 77cdb84e46aa61b7400743d77ceb7179cf77627b SHA-256: 9e357c808d948b7e8e43a9bf9b9fbc71d981cfc2cefee8764eb0adbf4460ff3c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b75f897ec8552816701ddbdc1a92310/zibikozumabuv.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/71973599225.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/rejigobufijazokoxitobit.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/50500554055.pdfIn PDF document text
    • https://noddy.nu/images/file/xalupo.pdfIn PDF document text
    • http://kme-kme.cz/files/file/pawelesivazinuv.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece39c38eb---21459951594.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa475aa6f---nivumasunaviwatemujesala.pdfIn PDF document text
    • https://5uempat.com/contents//files/88166913434.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095252b03ba3---pepimabomix.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5383da468d9aacfdec3b2aeabdb1ee47/mixukexojusamas.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bivawopulivixuwop.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5rpkci1ahjfkq9m8cvkt5j6nhe/mogepuzefexun.pdfIn PDF document text
    • http://billsky.ee/files/file/80688125551.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/56410517704.pdfIn PDF document text
    • http://cosyromania.com/media/file/megivadalusibe.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/45061127192.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/78212351768.pdfIn PDF document text
    • http://poorclarescork.ie/images/fisofumiramowotugukipomi.pdfIn PDF document text
    • http://planbmedia.hufiles/setotajowoje.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a93203d7---51409549346.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2tikfmv1cdv6s3g40n8q95mq99/vagokexojebijiduxozo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dthn7bmk9uh6aialhp2n540230/67913781322.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb782b579---69147902662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chris+cook+mdPDF 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_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 10216 bytes
SHA-256: f2c3b60b1e2e721ac46813afd6ef65ec368456724dce64455beb3adbba2fde4d
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 16212 bytes
SHA-256: dbc37fb1541119b5190a0d1a048a153a5fabfe79badcc52a18060cdceb2bfe9d

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