Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1edd5ab61a1e777…

MALICIOUS

PDF

79.4 KB Created: 2021-09-24 16:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4861c6260d627323178fbc2916cffe31 SHA-1: 81cdc73582e7e44b79422ced58d3ce0c28dc4bbc SHA-256: c1edd5ab61a1e777886fafb37c29c26ff5dc73d2b516a12c091a27cd8088fca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=green+net+vpn+premium+mod+apk PDF link annotation
    • http://alrabbanoilandgas.com/file/files/13327696413.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bulonofozeleturinowo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/tapobog.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161464c368e184---zimeri.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zizujefozowuxagav.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/76981206130.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/4589727695.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/749906ef649c55d0988e43e5962d0620/92135672354.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/99319203895.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/kaxagejipusasemube.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/2807799339.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nibiwafis.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0a1a95ab7---bufofemetudujawiwak.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/37703254267.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/tozinixufikelolejumezu.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tamepureranimizugigoturig.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614565305bb9e---68705917953.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/jigaromas.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wetejuzavibawum.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/relufudejotimev.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/57256961442.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jesogetifagazu.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/rizaro.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/worepukajofarifadosax.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/85182903542.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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 10636 bytes
SHA-256: 92d9ed8f98be1cc969fbd33c98eea824514f5cdb3affcc9995585ff428aa962b
font_01_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 20848 bytes
SHA-256: 070ffd9b97b0313da4e9af742f9bd514bd7c2c756b6c01005fefbe4df31ad30e
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1