Malicious PDF — malware analysis report

Static analysis result for SHA-256 364c31cbea3e5181…

MALICIOUS

PDF

128.8 KB Created: 2021-09-07 20:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53a9fad5bf25ead74f6064c4a1f8b3c6 SHA-1: bad0dd5a87ebbf919372aa0f6f4a1d64ee6406d8 SHA-256: 364c31cbea3e5181f85ee9d63dca6219547a286d2839177940100bf2f12faa37
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nineslash.com/user_file/file/pusotizuzamiburuwudi.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077544eb5d2d---wivasukizininusabox.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3909fc38---xuxivetatanagubevifoxezo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0550018522---31454772878.pdfIn PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/48276791005.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/5166869891.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/zaruvuzipitomurov.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7ec6e1c0d---pexapesuvugug.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/25463541510.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b62327ba7da---tudadu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5889d16ef5---zupefojibak.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/radokudakedikazotozoloson.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906105404.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/894831552.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/tesimasareludanavufe.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e467b20ae28---talumapo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/40670181030.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa2571fc20---ziwazabesojoxuf.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2cb3607e5ec6da0866e71e0ec0c3bb1d/87075285216.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///7066823588.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/viwuvozedavowoxamex.pdfIn PDF document text
    • http://soc-in.com/data/media/files/9710992105.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/30041052092.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b974d87fbc5cadb376bcf246420b2ab/lezifoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=well+managed+healthcare+organization+8th+edition+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_off00018a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A84 21736 bytes
SHA-256: e165d16fd4d11a689455c3b0dee0a9425934c877f32e6699143f36f04efffcaa
font_01_sfnt_off0001c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAC5 11160 bytes
SHA-256: cac0ea0530ef357d6c25ecdcb43f3bcee94d6f0a9db55e2addc7ebf2fb598e23