Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e77bd254be9406…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 10:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a8f0226c1dab512fd474dfebba143f9 SHA-1: 30422f65a47c32068aee326642e87d026df7f0bc SHA-256: d5e77bd254be9406b3efdce71db1b0d4a1cfae8f545986417ad2ddf4e5a5a6ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea7d4d6100a17d54314c0821c29ce0df/64538422588.pdf In PDF document text
    • http://altinay-law.com/images/file/luninaseze.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a5ca1b2cf2ad79065a04900084ae4a8/67045719367.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7bb1a687dc34c64e5705e2aab5a7c9f3/besoxavolezinut.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cfaac3d447779b9a17f816603fe0c1dd/42926191563.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a196ea63c48---77986384412.pdfIn PDF document text
    • https://33mobility.net/uploads/files/zasemivusabamufiriz.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/nomoki.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/27238687418.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086186ce67bc---97315321139.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/mijifofulitumewupa.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/19795856388.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/78735492736.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/suxuvuzulemeku.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608251d674641---37349209860.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a79b9466---18475601962.pdfIn PDF document text
    • http://centronegozi.com/public/21239133275.pdfIn PDF document text
    • https://samowar.me/userfiles/files/10450791743.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16215910704925.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/fudebolodupofukug.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/rosonoxekemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=present+perfect+vs+past+simple+exercises+pdf+islcollectivePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dcd3f2f7dcefd31566fc2c7fe33779dd/89495142887.pdfIn PDF document text
    • 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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 17100 bytes
SHA-256: 48b3c9622b84e92ee44a02ee774e4212818c5f72f1c68e2aeec7e09a4409ea2a
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 10948 bytes
SHA-256: 64601aad7371c9574dd35f3ac0256786c9b8b83814ba9427df8fd2e6d52c35fd

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