Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e51006fb02decdf…

MALICIOUS

PDF

72.8 KB Created: 2021-06-21 05:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6803831a04947112b636ae68205df503 SHA-1: 15fafa5ece9a83b132fd2dde1323d9b17a46b35e SHA-256: 1e51006fb02decdf1ba0a4f764a849ab9f74cdb83a3fa7c9ded5465ceaa9600f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Broken but beautiful season 2 watch online for free', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ac37ba2de7b51df1cdf3ddf7cccd52db/34182309400.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845787a3487---madodavuxexisokofupaf.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/31108720136.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/dolowo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174570b3d2---kiroxanoxew.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a701c9d079e---wapozelitujigitumibelopa.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/zukafi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c4a59a92---85679595234.pdfIn PDF document text
    • http://classtool.info/upload/files/58242552910.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/df7dd4b66048381052a39f0212a15bf1/nutofabaluroro.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6c40fefb27cd660dced7edf830b865b/19015144651.pdfIn PDF document text
    • https://dcimx.com/files/werutofusuwuja.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/sigon.pdfIn PDF document text
    • http://berbun.com/user_img/file/narugisikemijukiviregite.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/ximemasirizesulajulefuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=broken+but+beautiful+season+2+watch+online+for+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 5444 bytes
SHA-256: a6605289f7393327024edfea5f6a738a5f814b2aa79ab79f0536f723cef81b15
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10948 bytes
SHA-256: b639775892dd4baf934b14524d8e9df9dca63a5c50d341d551266b6dde9a1d97

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