Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6e4d18f87eb0ea…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 02:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 778d1031ef9c1c234c7e1fc1eb92fd5a SHA-1: 71a353a74795822594751ab1b8ddf86e54589388 SHA-256: 3f6e4d18f87eb0eaa1c54d6f24e8b2595b834b652b8d9edb3a6d24ae9d4e6b07
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress uploads and disposable hosting. This suggests the document is designed to lure users into clicking links that may lead to further malicious content or phishing attempts. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fenixfalt.com/userfiles/file/robekupepevabajisatajovi.pdf In PDF document text
    • http://paoladebenedetti.eu/userfiles/files/70484125192.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/disuni.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/23401737671.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/marakipeximijewokamozo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e9d5100d---14026860942.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/80634224443.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/47344228765.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/lonofoxa.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec23045f61---70682694879.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137909fab328---deketununujigijixote.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fgl88q7r254a6j56tmpvpser7q/solupipot.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gexikifusesilinef.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/73185756203.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/vedesowovuwe.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3963cf4f---wokujanubes.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/16651560232.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393854481bb---gawajafenudimanige.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/64850140170.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/16413287863.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/69937570336.pdfIn PDF document text
    • http://linza-market.ru/upload/files/lagolazojikisopokerazavo.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/88079632853.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/sisifufokiroxusefubipopox.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/kewoduzil.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/xoragosetif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=positions+on+a+rugby+league+fieldPDF 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16508 bytes
SHA-256: d0064367fbd888978169003b550c3905500238bfb6dd4afbe3c9bcd3029b8933
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 10884 bytes
SHA-256: 24532f248f327e683f8f28b5b49d888224db242e268553c768058f52536a346d

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