Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a2618e44778af0…

MALICIOUS

PDF

87.8 KB Created: 2021-08-19 03:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b89b6db74bf81613b327410438099e52 SHA-1: 96bf2786ef51739c66951d7fdbea8def49c6ae6c SHA-256: e8a2618e44778af0e0b9062539a1f00bd2c5dd33daa0f7ade4717eb57d974c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/44h7d949knfhpqtmd5j8orpag7/rawakuwuxuralutogedamozo.pdf In PDF document text
    • https://ost-fogging.com/upload/files/37900560444.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/xulodupobodusafusodebasu.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/kovowajezajogamebofa.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/20213243797.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/3811842396.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/gowaboxemububalexap.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gijapulevigurexuf.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/68255572416.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/zefofasawana.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/33585472320.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b037e598094---devepaveguxavotuxaguzi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/9541713402.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/duvidamatatopene.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tga1jao7u0qav6rhn90e0rp6pt/53713281198.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eaqsvvijma5ot6t06r4udn3lm0/60763269253.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e8ac5908---31557292899.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/70882389526.pdfIn PDF document text
    • https://suksesunited.com/contents//files/74043551609.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b538c57e26---70455812256.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07875881a---41468238811.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/7445797560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+v+addonpeds+errorPDF 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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 10352 bytes
SHA-256: a4d6c9ca7d87ae10d0ed1a1a92f674c5c558ae69f76bb0d65f9475fcbe55c10d
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 18040 bytes
SHA-256: 65e72a4187c159441f68ed31edfa2ff09c73718d10bf4bf7cfd59cb45c0a0830
font_03_sfnt_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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