Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e74b6c57f462b4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 20:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5db87825889a140488ddeeb9dc702c52 SHA-1: ae1a6fbb74c38c18e7bdff6b23273b5190acf491 SHA-256: 98e74b6c57f462b479af9d4fbe101903b6b3752d146768a40ecba5a18d686ccf
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. The presence of a link farm on potentially compromised CMS uploads and disposable hosting suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious payload delivery mechanism, possibly involving a password-protected archive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f44uedph4m8j7nkhrm0fn1aq6/nebok.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/vinoxakawizupevaxinu.pdfIn PDF document text
    • https://mojer.bg/files/guguxiwivorosubezu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/09e65f28fcf6c3a4524097fecdb4a25d/vivevamijurapogutizalaxo.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/83300934132.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c501aba74d7821022348e3d83fafcc84/rodefebununotujedurodepi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/886682cea6f16ef83c23a0352c0fb14b/1607185255.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/tibozimugubolosisulefere.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/sazusewuzudate.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/sedozix.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbd1f29d7---wafezujedofivefitin.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/rojakoxo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/89104001015.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/51062c266e0a58e11cc97ed85117c991/bufuwekubolekepi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00be75552---zemevifubafomelasubepawok.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/739f82ee87f0286e8689e281a51b7c91/melugujamumibudo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/87464728581.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/42590583417.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d412096f841b3b4300625900c9888c3d/rabakirub.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119937b70557---49442930570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gestione+del+tempo+e+degli+obiettivi+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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10824 bytes
SHA-256: 667bc54436704323268bef0f3aec3b22d0da8b5a137bd377dcb9abbff63c2b4d
font_02_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 17760 bytes
SHA-256: a3a3e1dc12d9137dd04a1affce0bff6983d60140b9b8918ea6053c83d8c2ed13

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