Malicious PDF — malware analysis report

Static analysis result for SHA-256 de35ab64209761da…

MALICIOUS

PDF

73.6 KB Created: 2021-09-23 15:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3095c97d15aa4bd5742f624ec3323cc4 SHA-1: 76191d74394e50fbdd53d494129a549e997480f9 SHA-256: de35ab64209761da577c5698170b844cd8893e72961db9b372c4afc0c944c99c
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farms indicates a clear intent to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rabudiagnostic.com/userfiles/files/fudowupumajiri.pdf In PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/povasukimodag.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6a6068daa04504deb8a45e8d78f3eea3/zikelavotibotagox.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/83950955234.pdfIn PDF document text
    • http://ccadl.com/files/20210920054742.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/defiw.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8c352d730---tapigotusaz.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/46343613444.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/19863141876.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xididopevijajo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/95684134000.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/58615387399.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/92557208547.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/nugukatalovopu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161408ce516ab2---vuwobovomoru.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613165ed8b14f---luwepipadalisesodan.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tiperuwogudogu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/164371bbded6eb3ecd8484601f45f280/75000227861.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/fuxinepexavubutulamufu.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/9322303665.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a043b680e0---86899551889.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/17966145272.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/92826940001.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/rimaxefima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shazam+for+android+apkPDF 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_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 18408 bytes
SHA-256: 4a1c36b285cb44340d353d47132a6c50268bc311679efdca49e6f883f596b23d
font_01_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10544 bytes
SHA-256: 83a7d49dc11692b8e86426c2f4a00a79e87d7bd13c6ec8bf7830ecec03a17352
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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