Malicious PDF — malware analysis report

Static analysis result for SHA-256 4addcb21e52dee01…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 14:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d251fb444e36c7f3250233d15a5bbe7 SHA-1: 88facedb6bba88b11b8fd7322bae14ea17e2fcd7 SHA-256: 4addcb21e52dee010ec2fa8cf8eab641062c54c17beceb4759281529b0fcc4c2
164 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically a fake invoice. It contains multiple links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e2e0b8966b2062a5492d85d39c2a87c3/katujiwudijuvefaxoja.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/lurasa.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e036f8c1---57461282009.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/37937381372.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/53819766758.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/55639213519.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/96608675581.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/wejoserukamipipokanedik.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/28918998016.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mofufezeka.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/kesusa.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/82380233422.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611737fd2e396---14095366877.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/rupunuzevijeguturur.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/gonexosorajawekavexuselek.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da14bf291e---16426633005.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d059157968e---13324394271.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/namawozobadadures.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b120ce2f---buladusupobexego.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/gawuxituxilofafi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a50qrqd8qkeeg375bbo0luf27/xubal.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/suwakobodanepetivekum.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/lifogarujozexepuselogasef.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210812_192112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cash+invoice+sample+pdfPDF 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 18216 bytes
SHA-256: 2271d43746582e6c3d4dca3d06732152508d38ebd6dd90c73e02375dc5649356
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 10784 bytes
SHA-256: 75f52d42be45f7c68cdd17e5139c2ebb8ca3b5459a75624768d682b12dec7f94
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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