Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a47f21b1592715…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 15:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a22477262ff79a27bd6c2bc9f9027c51 SHA-1: b56ad166f55335186179f05de3f207791bb5cf6a SHA-256: c5a47f21b159271563c7752d8e02bf8b2e64a2b879544f7ad9071cb6ca1145c0
164 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 or redirecting users to malicious sites. The presence of multiple external URIs, some pointing to compromised CMS uploads and link farms, further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://network-italia.it/file/89280248984.pdf In PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/5849609603.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b73b1d7f9---11341671012.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/loxemojujufudalebigemi.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26b4c72eb---pogiraxaboxa.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/50483149441.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/93171198698.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-8-20/20210820193700841475.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/fukitodunivijo.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/givetupufiwojozav.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/63093295460.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/xopexajalowepuripakafenix.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edaa85ee4ff---19556641589.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/61322682080.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca242ec53e---3694693177.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/moxexu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520072550708853.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cd834afd62b42f3436e2ebe6b4be3b47/nodoretikurepimeka.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b755f02f81---wudodonopamedi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806b7758749---zurezuguzabiluparuxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bible+in+english+pdf+downloadPDF 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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 17684 bytes
SHA-256: c27d66730e6fdc8fdc1d46fb23615ed2010d6422fda6a945b887a3f55079b32b
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10856 bytes
SHA-256: 16cdf8e5eeb3c122bf4b0d60bfc206a63287d3042227b956d4d40d30dddd203d

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