Malicious PDF — malware analysis report

Static analysis result for SHA-256 63adc5eec2c971fe…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 21:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b267f1dff1a836818c37c13b5459c1da SHA-1: 1059b35026668a156b9079d8c60251a62ac1d210 SHA-256: 63adc5eec2c971fe4cd46b75ee97d66586f6b175cbcb9713970d3ecda774fd2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting an attempt to distribute phishing content or further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings reinforces the conclusion that the PDF's primary function is to direct users to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tianfonmm.com/d/files/manuj.pdf In PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/26823613710.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/fesapefipujazajotu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/17941578145.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/sijixiwetanotebonizumid.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9q8dc9i734c24oecf87dth8004/nopitoge.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xikuzotepulemivunor.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofeledopapobivoruguk.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbdc37879---lamovesevuvijuzugiva.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210914_090418.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/95253583649.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/bojapedilitekofe.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613515837ed64---lexipewidokixapugine.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/tuxotiduretogiju.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161333c08e3722---42416598365.pdfIn PDF document text
    • http://ecole.ru/text/images/file/36780949399.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/27099350468.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401875efeb7---xelibonixiratikil.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/29858082991.pdfIn PDF document text
    • http://scpt.it/userfiles/files/14483932223.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/42121930958.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/vulutilosinawuwemaxunixu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/gixopo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/47126930295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=photoshop+2021+save+as+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_off0000bbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAE 16636 bytes
SHA-256: 8ff4e918a2ebbf01cc84e101ceb7b58a3bda24f3b45a40adecf73447ff088b47
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10616 bytes
SHA-256: 47f7de82846132d3908f6a4eac7851982f492d1b6149e5c6e58507a6e1da0913

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