Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbf9138215d4d60…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 06:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b0fe649d4ebd59c15d27fa2251b7802a SHA-1: 6a82157b7fb2b145b6f93ebc353eec30384bbecb SHA-256: bcbf9138215d4d60359a308e55e0dd3117bfc54367e6a3db096d32592baf5efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and external URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://rghsalumni.com/clients/82979/File/49760119879.pdf In PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210708_120548.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/mejolaxeroloxugefebev.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/9212184062.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/xafomud.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/fosezenadow.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/b7dmocik7lddtk21s9auf71mm5/76905378953.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080614d71d81---pewas.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/mamovido.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/josubefatumegajet.pdfIn PDF document text
    • https://okazionche.com/files/22218253387.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vd9sg2vn54mnsvjn8o556l7dul/gelutisadazebapir.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/japodagefozilarilux.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/vozavewelo.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/30174835985.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/59586908945.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b1fc1cf5---dawosezowuwumitumilidutu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/77761546495.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9fb8111dc82ad734a3f18893e7afc534/vumavawulesafu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b9a2d4bc---jinagomaw.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/mijilaxojabuzusaniw.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/bedebupenak.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/dugow.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mcuuo9e5t40imqbi1vrlpoj9g3/54618482318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=an+old+fashionedPDF 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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 10232 bytes
SHA-256: a5e434630d342363fb3d65724007fff5f4dc48d057c6ab28927f3ecaf06d2952
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17420 bytes
SHA-256: 28105d6bc9d7cfab3694cb01cb894b70ccb7d93573eb29ce4c668482d5d67241
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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