Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5cdb2907f59370…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 17:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abbda69e6772a6cde48c50f688bc5f85 SHA-1: cbb734eb2d5c60f3d25b9f5316cf9c551c7ea757 SHA-256: ef5cdb2907f593708acae1ae6df9529df5b16501e440363fd6611f283bf91d65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=download+whatsapp+for+samsung+galaxy+ace+s5830 PDF link annotation
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tikoxofogosiziruna.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/76150653598.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/65593623671.pdfIn PDF document text
    • https://allianztc.ro/files/file/39367225839.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/bepawesimuzuvazavimot.pdfIn PDF document text
    • http://qdjshg.com/files/file/lagibavis.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nopipavanarigov.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/zedufasozavesamewafix.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/sanonogatuzuseguzar.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/17517149037.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/lawitolu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/10048961597.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109110346569439.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///jolabelotad.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425352b92e5---74521646331.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/95588152482.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/14217783991.pdfIn PDF document text
    • https://bataretak.com/img/files/file/parifolerevosomi.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/selakiwo.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/16873942872.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/87574111392.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/bowikerimekakogasuvid.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vosurawine.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613451a2b51ed---gujiwedozez.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a45e01d50---fevakixafafekezopuselelix.pdfIn PDF document text
    • 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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 17912 bytes
SHA-256: 544109bfd83416724770b9d8d1dd9968031d36722682342bc81da3de852b2aba
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 12016 bytes
SHA-256: 63894495ef29fb35639b712b262bcc857d7273933360e8ece463d32d94651d8e

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