Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e993889bcdef55a…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 10:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33f206be244b55158b3ab044cd145806 SHA-1: d8afa45826bd71bbe39c61f9f2f2d08f9db535c4 SHA-256: 9e993889bcdef55a2ef4f13eaf0b7cab1fb8f365280ce31aea41ff3f3c95335f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, many of which host other PDFs. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b790b683a3c---86324711164.pdf In PDF document text
    • https://novahealthclinic.ca/userfiles/file/30790495244.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a7b5b148---29410189458.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1he76eigms12tr6mi1lucinus4/71633572059.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc42d155a6---kurifowomaxake.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/24041514573.pdfIn PDF document text
    • http://asfalon.com/__files/file/74916763043.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3269f57d6cb414b58182dabc3d38c6ac/9368237161.pdfIn PDF document text
    • http://esejsc.com/upload/files/45694227228.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rexogexepakikif.pdfIn PDF document text
    • http://adria-ex.com/27373338962.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/venadijan.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609763187876c---46507061476.pdfIn PDF document text
    • http://willbramephotography.com/rezifogolemixaduzojabiwas.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/wimatoxibaroxibutarena.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/23025782485.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wewabivaxojipuxife.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66138285157.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449852d5a0---fifedezinerejajosogaporot.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de93043a7---karivalaw.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2545c859d22086d7ae471a385b431e80/wuteruninizowe.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/54a03u1r9m54r1vds9ig6uenv8/2689086101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=most+expensive+knife+sold+in+csgoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 17744 bytes
SHA-256: ebae9bdad13f274430dcedceed0a0cf652c0092a77d4f5e15416a6be44d8822d
font_01_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 10788 bytes
SHA-256: 99a1661efd4dc24689dfc497edf64ab64a940633cff06da9050cb76a6ff4ed8f

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