Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33ad65d6f0327ae…

MALICIOUS

PDF

87.8 KB Created: 2021-07-24 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7862b276a5965b9174d73ecdee38a88 SHA-1: 9ad3da1a42c077ae2f0e922130fcaa50a966e9ad SHA-256: d33ad65d6f0327aef23123c04c7d41f3bd65e131f0a13734d4dccf2f21b1da30
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a 'Browser extension / update installation lure' heuristic, indicating a social engineering attempt to trick the user into installing potentially harmful software. The document also hosts numerous links on compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/635cb944248df4418d8320fdd6e9de8a/pijajekazuzivarewiwowu.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/58247433347.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c105c60fabb---21390665482.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lelina.pdfIn PDF document text
    • https://ms02bet.com/contents//files/wodejopojifenelomafijer.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/t8jr3vof9abdebsf47br0qofr2/76373284943.pdfIn PDF document text
    • https://badrivishal.com/media/18037948335.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85b2a1642f---wuroket.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3cc8a6995e7682ac8985ec017021d026/rebefudilowunojulib.pdfIn PDF document text
    • http://pi-consulting.ch/download/mumetuwewamowuxiso.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b2c45e9e---97189960558.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7c0a1062a586ed38a27bd88bf5eb498e/kaxebuxisidupene.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/89342251272.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/h86ug5kevedjh6hv98eg2gc8ra/42077435933.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/01ad247baa796aafa60fe8b151625386/resawoxinomufipefuto.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gusipalorezimuwibanubup.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/nivejalorojananisikupogir.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/13843780737.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/f72ngk25c7g1im5lalcg125j8a/gugotogosuwezixabesa.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/rewusulefefe.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/31605276892.pdfIn PDF document text
    • http://primaneighbors.com/userimages/33669582940.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/4630512083.pdfIn PDF document text
    • http://parentini.it/userfiles/files/22983054575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kirik+party+movie+sinhala+subtitles+downloadPDF 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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16920 bytes
SHA-256: 6070766e304f359e9b1881b984fe15c483c99a68246a5ffc94080cac2de93ac1
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 11248 bytes
SHA-256: 30291972c61851c886bf89b13c6f059cfca7a780c22215b373136927a373b8df

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