Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bca7c50add474c5…

MALICIOUS

PDF

225.8 KB Created: 2021-07-29 15:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2da16fe25e5b3391ba6dfa0103c5bfd4 SHA-1: 2dd7a0671a2b7ef2394cfab29f3f8755fe23ddb0 SHA-256: 4bca7c50add474c5accbec628c11f9a0cf76f85a00c09ab86f9c1a771c6354d5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and ML classifiers, indicating it's likely a phishing or malware distribution lure. The presence of embedded JavaScript and external URIs pointing to compromised WordPress uploads suggests an attempt to exploit vulnerabilities or trick users into downloading a secondary payload. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

Heuristics 7

  • 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.
  • 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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6i3o3nn6nnql34i3oqhnfjda9/41604058427.pdf PDF link annotation
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df462ca52---50237978220.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cf51d6d1e58c67d8d5276df3eae119c5/10398521288.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/49742473921.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/nelol.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47e5d9505---kedukagipogakumosupofa.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/wutajawerafa.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/96620gm8vn2s06aifq97dcf8k7/57956434645.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ufn30sld3ttih08rbn7ubock6/94845809309.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986dfd04cb6---94913753188.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dunifa.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/sovefafumuxu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93d1aa099---kevetuwetexazive.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8cda63b3bf1e04439840be870dea746a/gupifemexiganipekikiva.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/58653562555.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210629_27FB060F21D9714E.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/wokema.pdfIn PDF document text
    • http://chapelguild.com/images/usr/23491501526.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a4f85223136a2cecfbe75e0d0b3fe213/34735881154.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17eaa1f33a---gipezenogevujivil.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf97f49467---16060695694.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/6660735162.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/texarabo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/dunadurumeboxomebagodebel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3983b07c---wosivexafi.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/lokapizipopofonew.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_off00031573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31573 11304 bytes
SHA-256: 42c34f2bc18971825a7bc557cc0c470552f149333dd5e10475a3856995276c80
font_01_sfnt_off00033007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00034819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34819 18172 bytes
SHA-256: 1592c4485e74f7153e8b66fc607c8c5eddd62be1f9c679dc8530309ae8d8d88b

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