Malicious PDF — malware analysis report

Static analysis result for SHA-256 711add5adc4f22d7…

MALICIOUS

PDF

92.4 KB Created: 2021-07-27 17:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d779029f9c895ea8f357ad326d09c8da SHA-1: 42c0079224727cbd1f4a0d35779030b515643ea9 SHA-256: 711add5adc4f22d72fea6ee0b1716c1d6c606a1516ea40aee20b95f5a2788bcb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cu4lj1a93s78hg8kvm88i9icc3/dozuvew.pdf In PDF document text
    • http://bronia.org/userfiles/file/buvakirix.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/59e9436d47eadea3bc1a6272997d01c8/doropas.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/92888311939.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/91559667900.pdfIn PDF document text
    • http://championsview.net/userimages/11349496778.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9a2dedfc944b03d665eafb90418e82a5/28792117314.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071312545236.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775036110f6---15849691901.pdfIn PDF document text
    • http://health-bridge.in/upload/file/10606807298.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317543de26---39590161446.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160952e40249d1---87150588675.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/85930396058.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/fuxeratomomulabefomevubow.pdfIn PDF document text
    • https://camelcarpet.org/d/files/93961809209.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/rusav.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/b2budi46k9ppnu3o23gdl8jl0a/zirapokus.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39ad859b3f---6427088632.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/82403947474.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607761fd1e09d---99148444278.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/25117561376.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c4461a31860ebd795389f1963b3634a0/fisavawamuselisebawatami.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/65000649990.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/604b50f62b5871db5889eddbe6959159/36358075665.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/36090877042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=atlas+copco+air+compressor+fault+codesPDF 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_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 16960 bytes
SHA-256: b11f931561bfc572de80911c0dd3bdeb8a342f48e0104d3dc88ea1c3f293ee85
font_01_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 10756 bytes
SHA-256: 0bbfd293fb70dc85cd200a1d3945cb09834f49ca2d69ded8ee527092a7564dda
font_02_sfnt_off000149b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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