Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2fec364b2718d0…

MALICIOUS

PDF

92.1 KB Created: 2021-08-05 13:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 588cee8bd13feaaca1a0de9978473736 SHA-1: 35de762d633e3741a90d3a5e78c10436ba0ae3ee SHA-256: cc2fec364b2718d00aac2ed679cbaa293f05ea4b24ed18848fa88deba083cf86
204 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, which is a common social-engineering tactic. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support a malicious intent, likely to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rnha6mnpomou7jdbsdfqsmnuc0/51467701993.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608043a377608---6408703828.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5a827a4eba0c53160b961e97511ebe33/58309411450.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/50080febc86e9f0b0b98f46a011d9eda/wiwiler.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/susokoralerov.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/39470648513.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/8453476362.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c6ecdc29---72004419100.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/75880262004.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/96699c3105d53e9c174f2c163ae42075/xunexex.pdfIn PDF document text
    • http://feg.vn/uploads/files/gizinevuwewolulabenepiwup.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a77ab090c67980cd4bcfa413c2a2674/mawoxokidemi.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/tagiviwizanu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078a215300ea---wuvoxipuroluduwu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607866d5e68b6---93072887002.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/ravabusajuxaf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e478232a9a7a6d1e0817b907a7d47a48/13821901965.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160706aaf8b92e---nevetafafofisurerosi.pdfIn PDF document text
    • http://ubest.ru/images/file/58703969793.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/dotirajujeman.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/64621751589.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/18670166069.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608492353e8af---babovugegodazija.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/pulojajawok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=optionalpha+signals+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_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 18332 bytes
SHA-256: 54ab3468d28d356f15d7ceb3a591dc7f144e0eb93eba389ee380a57e9eb9fd47
font_01_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B02 10568 bytes
SHA-256: 36d42f61d69b1e672923c1ef0547e5311f835c99c6b80ca8596e218cff2253cb

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