Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcefbf4ff9797078…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 06:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed1c9b910f569b4cf917e73625aaa02a SHA-1: e3603bfa48b7da7ecfa292ae5aa2adbed864d951 SHA-256: fcefbf4ff9797078cf58b9eb30820a69532d543886591b2b9069c315735ef71f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The presence of external URIs and link farms suggests an attempt to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.bnbtravels.com/ckfinder/userfiles/files/boxupowumikavamonilapa.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13c1b048d---55399790435.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8fab343857fa8c0ba5edf5f15cefa8f1/xovekimipit.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sujupawezukavuwapir.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8tcjtq31sc8s1iav9lqmml8c19/kerorawukozizufinimedugu.pdfIn PDF document text
    • https://maturana.cl/upload/file/lezogobesudezefiw.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/57314964956.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e316613832---95615201234.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/71814570488.pdfIn PDF document text
    • https://taflanelektronik.com/img/userfiles/file/1583027998.pdfIn PDF document text
    • https://okazionche.com/files/20657143979.pdfIn PDF document text
    • https://majubesar.net/contents/files/gavedamigutamotaneru.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/52759311032.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/zivokipubiwulesa.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/mavuxitediwosotinufuv.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109221207443668.pdfIn PDF document text
    • https://irantruck.ir/data/file/nufenubexufuvu.pdfIn PDF document text
    • http://bankerz.in/qpic/files/77886741463.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/75189847419.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/rufibixoregesu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/68550901006.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/85908773722.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109131408239461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+bike+stunt+games+for+androidPDF 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_off0000ae1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC630 15384 bytes
SHA-256: 6ebf62e739e729afe2ca9d7e8d4169de6471ef526eafd3a8c7688336a33fdb48
font_02_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 11036 bytes
SHA-256: 1238cab83ff73f654312d0e3638373971337cd4224ce542bef88ae214509f41e

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