Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1638868b3913e0f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 11:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e95ce011ec3338235a49636c6063ee90 SHA-1: 545a8c657c6c888019144935a4b5027be39ecb4e SHA-256: d1638868b3913e0f45a6f7c99782e1535775b020e1d1df6b425cca6bc0e87d4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in fraudulent activities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://agriturismocorteerbatici.it/userfiles/files/pazixatosak.pdf In PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/68211021546.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613934d716b41---86651244279.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5abb1771---vorukivirazovi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8862b798208e8f11418a7dee616897db/99429776184.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/88109596912.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e86ea4c5d---metoxef.pdfIn PDF document text
    • http://datcat.vn/2018/file/24185721444.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/99620263884.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/46438c1068cbf679dbcc6de18598193d/guxojade.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa27e9403---43050396675.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/56556242446.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/gipizuwelebekugaxibubogog.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210909_06C7958C72C1DCC4.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906234839.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b5e465f83cb38ce9e64ce2b2af63f297/togifuwobapuzixorilat.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jolobolitusut.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xenifevejezidukixifipodu.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/81078177605.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/naxebijiw.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210901221957_n4pju6.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed70ec736c---jotaxukokunun.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161353d496aee2---67086850456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=meaningful+words+starting+with+oPDF 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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10812 bytes
SHA-256: 806e94b4521ecaf2e5b0762b283d79dcfa8d6095af91fe70ae4a6d7bf1aedc74
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 17376 bytes
SHA-256: 24f66f016f233665d8c65875dc8f7a8100ea8aa21b349b5c248929fd5a637ce6
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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