Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae87683000e5ff4…

MALICIOUS

PDF

106.8 KB Created: 2021-08-11 08:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d89d7769ef75543f25e6dba7bebd4b0d SHA-1: 070fec2aadacf7b2a86c06ff057e8d0252efc3e9 SHA-256: 7ae87683000e5ff4351d8962c22e15c82ee13bb12714d5e5205adec043173f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://4x4autok.hu/userfiles/files/rutug.pdf In PDF document text
    • http://insuralead.com/userfiles/file/61639124050.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/58aa9febc0532f8824085e87a65cd5d4/rapodavakifogopikib.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0fjcbhg13nvkb0gvnu7jec9glb/68113291770.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zereb.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be4269b86d5---davuxigateforesel.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/53098359177.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/45039694422.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6brql3mqt4taud3ca3an1qgo3j/66345189260.pdfIn PDF document text
    • http://fxmeat.com/upload/file/753afd072764e43492fee2b8b7f06e51.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/63404355594.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/18508080994.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/mafemuxiledoxuv.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7ff5ab5d---xububobu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776a06b8e8d---28083664479.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nijeworoga.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e6bv9g6ttdt6r9ulbj6i20ffl4/93180375594.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f2395583---xidoxaged.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6d0f103---9524332059.pdfIn PDF document text
    • https://moolans.com/uploads/files/javuvafale.pdfIn PDF document text
    • http://poiskvod.ru/images/file/baxetofagovinufarokumilok.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/53902479763.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/jukog.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dc02bbf790d393721256880433726a0d/sobafuzezibemujesuraguj.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/32500422436.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/labowamipis.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608697e53ec10---36380173552.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/b6smbutlrslr7mv5kepffudps8/jomuseliriti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+sodium+alginate+powderPDF 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_off00013d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D25 18048 bytes
SHA-256: 88dbb179d911c80301b5e021da0d810012e8e13b63a1db80555aa202f0966aab
font_01_sfnt_off00016bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEA 11016 bytes
SHA-256: 8499423a7a249191577107dbfa272631721333548951deef8b29157a526d8245
font_02_sfnt_off00018531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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