Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a53bcb0ea198b1…

MALICIOUS

PDF

97.5 KB Created: 2021-07-05 06:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c2d88aed9dc01f3e77d1776a3fae5a4c SHA-1: f1fe35d0758759d169278b08d150c4c71c199564 SHA-256: d8a53bcb0ea198b1de0e126169cf2687a7611d665a89fd71a217109624bf9838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://stroisvias.ru/userfiles/file/77395522514.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8bbcfad7bc2994938cff44b6c9e6ae5f/95082893353.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a435966fc8f---64880452454.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ae15d47fb9b1b3c85ec6482661645bba/jedikegake.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/1034528483.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd019d2c2e---jexiri.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/donupidajopuxe.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/dezerojabizemadowe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a218ec9b---60838723471.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9f1d4ea3cfa71c665bccd321852105ad/malaligediluso.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/dorerotuxexuve.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773920dd790---74756480473.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/muvir.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/54612382472.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/af96ed1df3150050c1057ea1c8bde507/safumifutogufisapokokix.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/74a5c00d8e79ba07857068152244f8a2/15077941586.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87620356881.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11470ea80f---rotajajafifibifo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9c5c3cc3---57754133574.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aacd15f68---13884883621.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4393u1ojr735a7mu8bdvqr4nbg/dogebobilozotodojizi.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/nebevixo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502200153495328055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=converting+10+point+gpa+to+4+pointPDF 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_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 10564 bytes
SHA-256: 35987ff99246fecc9503966d544f907278123a4a58405197f51eb879612f8037
font_02_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 17128 bytes
SHA-256: 0148fb0abcb75c5628939dcbc13fea8df8d6bc6bfeb841759bd3b21ef6384511

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