Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed73653033cde7ac…

MALICIOUS

PDF

101.4 KB Created: 2021-09-04 06:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d278d45948568b68d1c4bd9ea3d3b95b SHA-1: f96a70e81016ec2956ee8aad98fb6a911974a6a7 SHA-256: ed73653033cde7ac49eb6d0a3809eff2967e86e39df011dac0d559e64fb131bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate a link farm pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/rakopokajexamidajigimu.pdf In PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090411135624060.pdfIn PDF document text
    • http://bociany.sk/media/file/38968571590.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/22340524376.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/sapabolekogogokozanuzo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5283e2f69152bfdbaa50646b2cd6548c/23028387907.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/57767034494.pdfIn PDF document text
    • https://aromamarketing.md/img/files/68202911777.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088756594e39---43018083410.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f4999e2d6c31eb87d5b4f2ee48ddd5dd/xojelepalulukuwerumiredul.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xiteraramoxisow.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/24519921466.pdfIn PDF document text
    • http://spharma.ua/files/file/65454104164.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/55447389491.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ee73794c---17746962484.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5616762158baadd327fd311a7ea25c14/2347834067.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713fceadb52---20480401277.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fa5933bfe93726327dd07c07c8655fbc/vejanojulagesafedaramirut.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f6bd8dcad---70896734358.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/47385772836.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/logutapojebavajegemarot.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/604cf820e3aa0ce504010fc7b1481cde/sawewofopowenezudu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/42427433740.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/jewizipelosu.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/76572315470.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bf263a3a---43808860789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+psychologie+sociale+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_off00011d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 21844 bytes
SHA-256: 24a2729a7f353f0d7cce7c6e1462a03771076a1a008d329a7356ffd8ab2a7d5f
font_01_sfnt_off000154a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A3 11064 bytes
SHA-256: a23445145f6ea509dcb228830e0b835fa2d1a96123f593d41fbab431f7a95cb7
font_02_sfnt_off00016e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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