Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd0b7a07398dbd…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 11:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 946883fdc56491a47a740e2e96f4e03b SHA-1: 84ac9be7ef726450d21de9c2134d40bffe20b7d2 SHA-256: 8efd0b7a07398dbd9c7b11cd5e92abbaed37d0e75419ac1dfdb71ae33d8d7c33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://oniceh.ru/uplcv?utm_term=the+day+the+crayons+quit+text+pdf PDF link annotation
    • http://ddservice-bmw.pl/userfiles/file/88729101003.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/54693680587.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c023d86ebd7ef4f401137c3bfd752a2/foligoriwobuvufepiz.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ce2726721bb353645c8fb3e92733711e/gabevagedamitojev.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/db0d9107d599383cb5dc04274457beef/ridipilotilinok.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/76889774437.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lodawer.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729dca97f29---4676504027.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/guwonekiwixoxabarit.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500b21c125---tujipibomidimojapip.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/59c1e7e4d39761b1b292505e7b8c7c2e/65573490316.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641ff810d7---45569683730.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/63471637302.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fazesaw.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/65805592268.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3aqduqosq07d1jsj15u21vdj35/30796815342.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607230515634e---jonopimozudoxaturiliji.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/zozirubajikuveminivuxi.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/416780101.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/fiwelazunerovolowu.pdfIn PDF document text
    • https://irrisyst.eu/files/file/56453247492.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1ln3lvmj62l8d704gcarochdmi/45213100035.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210818_182952.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/13702350691.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/29975597854.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/fowujegafisatirefu.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_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 17048 bytes
SHA-256: e0dd787bc9d9ddcaecbff59b0ec5508682dcf630af60bde7e6ef03d8f70a7a32
font_02_sfnt_off00014206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14206 11096 bytes
SHA-256: 8115b162dc757913c17d9e03cbd348b4ea7fd7d490c61d883f83dcd0f0c0833e

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