Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0664ff62d97b50…

MALICIOUS

PDF

76.7 KB Created: 2021-08-28 22:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48d2605c58d89fc354635706801ba6ef SHA-1: f0c1942b16a9a80d96d8ca0124b2dc59e9affdc0 SHA-256: 6e0664ff62d97b507a34aa96f68180e8d3cafbff2a438210cac031b639e7af26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://animalscipublisher.com/files/upfiles/file/noleweboma.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0b0269398b34449d74096e0352e2b565/kimafozakedikowad.pdfIn PDF document text
    • https://nexusmediation.nl/files/lefowimegi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843115532b8---73901695984.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/96678419286.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/24288072058.pdfIn PDF document text
    • http://vanhacollection.com/images/files/padivuxupowawi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/kezotozijituwadudo.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/94187799349.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cecc81524---sifabodiparupibivoxobadu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/859b1794471bf7dc98e8f498f4b4ddec/xovuwukibe.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/77337905210.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/020d392fe1c50c99ce536bea3f07ed59/sakoxepifalu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946631d672a---15674288668.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80463152746.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/zedusiwereper.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d14ce7dd6bdcd606f20bf313d9b96588/vunodimaxejugitemopuku.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/posalapexojivamo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/33822c0fc65801c5fa6898f4437cf0f4/rugiwigolusolegusera.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3a5ef85---lavogusenen.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/morisaxafevaleva.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/gulibotokelanozuput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=oxford+english+book+for+class+8+pdfPDF 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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16892 bytes
SHA-256: 3e33242ccfbfd9347b0c5ec5d2d7c739c90396c2187092e5e503955fce5f49db
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 11368 bytes
SHA-256: 0c627a0402eb4b761ae64565e4440d72f9f7a25886f37fbd56263ee7b349e4df

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