Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7f5874f556c033…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 11:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27dff598a67909dbd12fc8117becaded SHA-1: 20d6dd7a6d484ece4b2b8f56605bd14dcbe53926 SHA-256: 4d7f5874f556c033a0a8e75c1f943eb1798815a0c025909c95541e18f663834d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=mobile+legends+skin+hack+apk+2021 PDF link annotation
    • http://staresecurity.com/userfiles/file/dubozebutuvudosuzagun.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210716142916.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/40833270383.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c3fc665df245b209c10ebf073f60e21e/jaruf.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/2977483401.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd2627589---36372982220.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/pimivubapidujevitomu.pdfIn PDF document text
    • http://inercial.es/uploads/files/86284286175.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/jibufatelevuf.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/jefazajojopike.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/temezozikerisuzizidigilaw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e45e7ed47---bapeboxeroxofomefuj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/luzubomidipomivotonu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/69300312275.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/8474867932.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160facab038325---muveji.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogosumotewifizupesumibu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/95c922f90b384c19c204ba5b2822828c/jezaderaniwaxubumovebewug.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/42178619241.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/53pr8m58feep23umlj8cv2lgo0/kosopegoletekiruzimidumo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf20c230f---17632761573.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/634601d2d621f69e95f7f329158cfb1e/fifonifo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bijiziweji.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/wemopuvabaxitivopilenus.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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 11116 bytes
SHA-256: 52024b611fe8c9285d79bb7f750e958dcce3dcce29e6256fb58ef004424d7131
font_01_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 16852 bytes
SHA-256: 52cf077926fa2ac5a0efc2d531a0ad684bc162eb1a3f3f1b47905f97bdb4b2ce
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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