Malicious PDF — malware analysis report

Static analysis result for SHA-256 2765b3fa2b625e50…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 01:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 000e07e88eb04330df6e60b47799e6f2 SHA-1: 488b7493bb371b997243d4fe29400a3ac8201d4f SHA-256: 2765b3fa2b625e50b5333e2d00ea639cf437eeeac3fa0d763ef3cba6c6e1e6ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

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 https://allytemp.ru/uplcv?utm_term=family+division+court
    • http://alnadaoil.com/userfiles/file/2960906399.pdf
    • http://lab4050.com/upload/editor/file/wesenozexuvosewademunis.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/2d9b3c40775436ae334fe68ac9705089/8423310619.pdf
    • http://fobas.cz/userfiles/file/numol.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc639d56961---14225724086.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morov.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a065aea11d7---42653010664.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d04e16bdf6cfd21c646339abe7e5f1e6/19569855302.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/16917276426.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77e0b1dcb8b5f893aa2d7e54f797e703/8607958446.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0c873887---38609666211.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707bf411c6f---noruretikiwowesiwixaduga.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d7673071---dejevapugomamigilinenosa.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe2927768---fadedudotil.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075104791939---nijosakup.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff54ab5928---puxesokudebonozasogo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a011ca95ee9---80774440719.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d7c44887d---nilagetuji.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/53839542370.pdf
    • https://ovalpolycoats.com/media/xopofawiziwutikuwopo.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10f35565d---bijilakafogituminawuvelu.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ne9bnsa08aqle006eov5gv16su/taradameviwotivuzul.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj352rgg3cvo3sa10een6l4fmm/98535447281.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbcab33b7---62950360546.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/499fe92fb6efee6d57ce46a70920d066/dosakumumorigolirubuzelul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb4.bin
793c577ca7e0d756e1584b849f94a45d6190e7ee2c0f976e312f7bcae9b81b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 17680 bytes
font_01_sfnt_off00012c69.bin
80c585724a399e8022ec7e3edb41c011a1c04b9dcae85ff6cc59c03bedd5893f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 10656 bytes
font_02_sfnt_off000144cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 16792 bytes

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