Malicious PDF — malware analysis report

Static analysis result for SHA-256 922b643cebfc8d79…

MALICIOUS

PDF

98.0 KB Created: 2021-09-20 00:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2734d37ce5f21629340d340747ad3945 SHA-1: 20fce979f018d71ee2d7f43bf0e0561a016e46c9 SHA-256: 922b643cebfc8d792fa88a46e007a20b9cf96789c5ab5728cac4ae294dc1d13e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://furniture83.com/upload/files/tolaroxawef.pdf In PDF document text
    • http://grancanariacomercio.com/documentos/file/nozubugiwajefanonik.pdfIn PDF document text
    • http://saaretravel.ee/images/file/62268063456.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/golalesokebuwekeva.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/63678616430.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/66349925851.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/87734955785.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/56747985298.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/32996787145.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/didobalituvemefaxixifoxef.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344f9e9d257---69746124894.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea0b8d43a---nuvenowevakowu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/41263488888.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/51871886a3d91c710cac515f47c21305/34170864249.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/wubatudutunivogipor.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/32835364326.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/66181120215.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/tuxukavefabema.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/wisibalegagasosivesoki.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210918_023255.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/vutibekelix.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/96647245965.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/85823647033.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/nipufibetuzubudokejiv.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/dozavurapuvojututa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=purani+film+moviePDF 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_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 21308 bytes
SHA-256: a9bf151cd5273f0ce438d2415a6bdda16aea51da082b82373eb7e21570174fce
font_01_sfnt_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 10276 bytes
SHA-256: 241d08ecfa08117d2ca3d6a067b8af48a494deeb902e3aba1c6cf04e410145cf
font_02_sfnt_off000162f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1