Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a303a6a0261b3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 02:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c86eb25bf0cbfa7bd3a34306934d64f SHA-1: 80288031fb5a2da57f2a12045a5b30e16d9ad0c0 SHA-256: e84a303a6a0261b360adf0b5ead28af5dbb96fa96775af59c0e6af7e21e5032e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL farm suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/je9s484rtrrve187i3c1ru01a1/59156353111.pdf In PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/26455149631.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c1gfkvpmpeobauskebsatl41a7/jerotirijuziwid.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/20162085002.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc4880c16---zoluxan.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d356032375621ff010c9d3e71e4830d9/reluxewamivosagabomatewuf.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nabosenozeb.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f4cb845f7---94571297372.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8e996cb2---babinekadajanape.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966805796e3---30717383171.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca808690a3---xotaparuzopupej.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa462ab987---27061638748.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/tekidotuxagewikalu.pdfIn PDF document text
    • https://sy-tech.eu/file/dixuwanenoxiri.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/73383704331.pdfIn PDF document text
    • http://citranco.com/users/files/vawiguzezozu.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/93274835310.pdfIn PDF document text
    • http://jngf.cn/files/file/78690672686.pdfIn PDF document text
    • http://nfc.soo.jp/file/18550144642.pdfIn PDF document text
    • https://khanikango.in/file/tuviwelemov.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/bafefuziferivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=a+midnight+summer+dream+charactersPDF 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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 17448 bytes
SHA-256: e95cab9bd0565772e68f66932a5f48afb2f3e833124abcb1e66fbe506a97bd98
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 10732 bytes
SHA-256: 0950da6ecfcf740c9332a6898d6eb0c0717b6bd6a64788feda0b280a544cb354

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