Malicious PDF — malware analysis report

Static analysis result for SHA-256 943dda870910a3e8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4ef0463d8f0d13436b2c6f279f5b78f3 SHA-1: 7094ae6ae5d7ff69ab4d5abcc22048e60a88c0ce SHA-256: 943dda870910a3e8b8f17e3d4444a0532e1a0fe6d613b187a6dc8d6abfe418ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dataction.org/demo/dataction/media/walijaxamabifujivumiram.pdf In PDF document text
    • http://apluskleaning.com/admin/images/file/55148067128.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/rapakus.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fotimazesijok.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ddpelk8rlacuhibhfpt5erlfh/70083849592.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613173e7cbc76---90149553718.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesorirurareli.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a422cd2d36ef594ca33810062e077c72/53656737988.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f8473b907768e37a7f444fff2c642ffd/gedude.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ea6d88f2---veviwazesutesapos.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c579ef76828f163da15949356a5870b5/fesikekebob.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/54a8f9414cf4b35b929343b2bd1a6df8/719038777.pdfIn PDF document text
    • http://kotolantopeni.cz/file/58895341186.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/24761708859.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/jomujodun.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/92673481442.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f5766204---33386333944.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117264908955---pigivedi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b7l9oo9l2e4t67g2vt5rc0g99m/14157788183.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1a6c5c84b830211c108c058565222ff8/56901579094.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/54072340554.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/24448368207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=toeic+reading+sample+test+with+answers+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_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 11116 bytes
SHA-256: b244f71b50fde9b85869f7f2459d9e0c0757b654f4d3d56ed84aad4e192a69ac
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 17844 bytes
SHA-256: b35ded647798913339a86d2965a7745f9c203d5b02fedf81f64a43f8c021fa7f
font_02_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1