Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a73295d07dccff8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 05:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dd875e48c833191938980a6dcbe1186 SHA-1: e602d430ee20de111e6084f366eaa2be0c011f30 SHA-256: 9a73295d07dccff8bb5d3a5be7ba14c701b3f8f51c3f6be236a10e009924d553
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The presence of 'utm_term' parameters suggests an attempt to manipulate search engine results or to disguise phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=oxford+reading+tree+worksheets+stage+1+free PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/fa304131267628be8008f7bdd3d8478d/tirogazekalatunibe.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85cf2ec465---5771883731.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/80679745689.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5a7096bf24c87a694620039c178eea5e/visubawejupexodetulumuz.pdfIn PDF document text
    • http://lactopad.com/uploads/files/rimedafawagixumabutijupe.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gpds110adt500i0e2hkha19t54/kubiwagomogimejobap.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/84312658932.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/29364107238.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8cab5524c572596e34c50c28ab353171/58141696006.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/60026201257.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/tezen.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/12930449875.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/438f7be4d60be957af401ea6ffbc29cf/laradonoxebu.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/wezitobit.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7382e5f5---busadupajova.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4cqrnmk73nimmr79ejb906rt5c/zukivebebunoj.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d4839cd117f4e36edd5d01f85b03edd9/23739803494.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8dpd771u98kc0l42shoaob5bvc/gulaxepuli.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/41431920909.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d814464953---90927212665.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad97ea2af---70403342024.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjbbfhd00pam09spfrejf0qvu4/dubinazi.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/10544755042.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/dakugivopizubesijiro.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5ptsmhou0ujm4rcnfpes8q18mr/nijubizexotugekijofugot.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/jibizenedanusabero.pdfIn PDF document text
    • 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_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 10944 bytes
SHA-256: b23ae4f0434bda6d9cb138d06b80f78321f7489fee7a69e42838926acc97c9ad
font_02_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 18256 bytes
SHA-256: 3615594c99d8b28f6863774bd8c8306482c64600ebac2dfdf4f4d9cb9c5e5ee7

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