Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aefa719da068f4…

MALICIOUS

PDF

96.9 KB Created: 2021-08-07 20:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82a1939fb50dada51237d2b5d547dd10 SHA-1: fb5ca4ec938f3d281689d5bacababd5c4e268ff5 SHA-256: 41aefa719da068f4b7048acbacf68b9ed0e454466dc95ad810d22b2a7d1606de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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 http://ecole.ru/text/images/file/joruxajexugurunugagikefox.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ed398bd95addac8a700a1c51231ef82e/tugoxikivunibelowis.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/46411077838.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b736af50761---nuviwawe.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/52007119607.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/zikawatogorenoke.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/io58p177p2gl6ds58e7ob500km/resasekuwazebimen.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3f94ff86---dizodizojibolamurapez.pdfIn PDF document text
    • http://sun-eko.eu/files/file/vewavudakanupidotenebe.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/nidinejukumix.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5f50c250ad24efc7e8f1269aee862748/46345408598.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/rasegurijabatatonizizuv.pdfIn PDF document text
    • https://rosycaffe.com/file/6161142723.pdfIn PDF document text
    • https://diphong.com/uploads/22624569040.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/36965984248.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/36001632128.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706172d2f82---68717082625.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/93986229144.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/36587600835.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ja4ln3708q72s3jp5abu0uhqlf/rafifuferepikadudonuvi.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/paxedev.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd19c622b42---23142654918.pdfIn PDF document text
    • http://fullx.net/files/47119468351.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f1c3f500---16487664939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084103e91a07---99821644368.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608148ff871d5---xugejiwukokadobitonetut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=giorno+theme+piano+sheet+easy+lettersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 18228 bytes
SHA-256: bf36f61766af3e77ed7d1b2d8ba1e5f172421b5af4d7ea70354c7c52084830fa
font_01_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E0 2572 bytes
SHA-256: b726a7d062c63f52cfc1306df31a61cce46cd61f3c521d08777c738739f7cc31
font_03_sfnt_off00015bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD0 10672 bytes
SHA-256: 48a7170bb0e318f0b6194e4070b1d64469eb28e8e26dccdeb6f1a9ad6a247bf6

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