Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbd14d6479c1389…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 17:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: accaeb53c1aa78dec79baeb2a7818edb SHA-1: b2d53119526d1784862633b0fc23d753b2c2f64e SHA-256: bcbd14d6479c138984287cfe9f3e8cf29b66539cf1afa62953e5b98172d4c381
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alkanboya.com/files/file///nokutomosuvog.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cb2b45cab1ac21a99c890b505bc052c6/46863262177.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/nokuguka.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/26918577558.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/vaken.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/jigexopirafi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/992e1deaed02074ab96226eb72c2532f/gabomugize.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096977087c1b---20365378179.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/34378461521.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160779c13459ec---42269883028.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609eddf33e25d---bofapuvenilezojikozizi.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/fexevalopugibujavitepiw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ir5or7854nbdup7qql0qlav2l1/lalowibasif.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/33805860243.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b843511afa8---17971204994.pdfIn PDF document text
    • http://erictex.com/ufiles/files/72588568555.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab457049f8---vakamapida.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/riduvigaf.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b25c358fa---bogakogenarup.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4604627be---8787033689.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/25578856280.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf1d475726---sidixipupexaremo.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/maluvuxikedibu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1b0d25a0ef41fbb6a65f045ede35bfde/gaxidefirepozolelupepum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=world+of+darkness+rulebookPDF 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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10480 bytes
SHA-256: 65c7f4fdfdfbef4d881daccb40c9a442613f38a8820333d40127283537625fb1
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 17076 bytes
SHA-256: c21cdb095253fba79cfadeb7c29a4fd8a6fa430f1b26ae86c2dde23e2a2c9e9d
font_02_sfnt_off00012f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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