Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69c3d6fd19a6203…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 05:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cf842ffe4463e238ea507f3fb8d58986 SHA-1: f694a60e380699cb49fb09c574b83f1c9705bc13 SHA-256: f69c3d6fd19a6203ea6292d57f2f3291a68a97c12e7a754311a16f8ebae6caec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=kill+la+kill+manga+pdf PDF link annotation
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/gexulusagafixekinutavur.pdfIn PDF document text
    • http://hanauhrova.cz/files/kinowoverijopezepe.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/51095922615.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210912063830.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/xugubebit.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161351a698ae6c---34332164886.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a929ff08d97b9cd9053477e3efa07d3c/sebelotufuruguvipe.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/11202531452.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/gonesuwa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c08094ff0---4616358185.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/diwapijo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/taxetojabasa.pdfIn PDF document text
    • http://machulski.com/public/file/89979234879.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/bofarupejegis.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/9814929253.pdfIn PDF document text
    • http://mutitar.com/user_img/files/9491952610.pdfIn PDF document text
    • https://pellevah.com/upload/files/saboboga.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138bd12b79c4---86254457032.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/37226839687.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092022501173499.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/24270756724.pdfIn PDF document text
    • http://finchamauto.com/pics/94821543474.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/petularugiwikap.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54f5ebab8---89075714938.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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 17080 bytes
SHA-256: 40e2c5a35d9c03d65755a21ae10acb36aae1cd04fbc6ba5840a217c4bdd6df82
font_01_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 10304 bytes
SHA-256: c97e3ea2e2a8ae8ab0f4277c7c85b94c309c9ed0a4a0a0e1613061006c067d3b
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1