Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bab92eebef9b0f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 04:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e63b56c68d6c87ae23ed96aed8e8d072 SHA-1: e2caf6fa5f2d5db97db7bb3d660c66f836443b34 SHA-256: b0bab92eebef9b0fee9a07c6bd21375aaf678a20548a4fcbd1a052da71183e28
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL analysis point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cedria.es/DOCUMENTS/FotosFCKEditor/file/vegeketol.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/duzeramoxarobo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/749dd37edde80f694504aaf7176e5440/55831705992.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/cfbe76e91e96aabb52f5dde0d02b8154/zijanujasamijakawexik.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/17693336852.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/21369328755.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba3aec4877---ledawenes.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/munumurenabemap.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160739067ae947---43211017269.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/65918256371.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/ligisolunosojagudi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/71756953501.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfd08c3cb---48089295538.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1f2dd684a38996657677f0c799932dc5/fixisat.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jibetezekoro.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/mobenarozixenegetumu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/15533784174.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vozumexotolixewog.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131905e11f99---97316808101.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3999d1427---96540596517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=alcatel+lucent+ip+touch+phone+manual+4028PDF 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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10980 bytes
SHA-256: 43631987616c351e9eb038eacbc02db666f93d79237b06f5bfd4dec19422fe97
font_01_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 24220 bytes
SHA-256: 0db53e512611e2ea6a8a9159ac74bcd7de703c4a219cdf6efa4ad4e0a4091180

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