Malicious PDF — malware analysis report

Static analysis result for SHA-256 b380e139ef7a3d85…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 08:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fb8e776be121ec7513ae8429423490d SHA-1: e06acb19acd7971c9454fd7fab5cce26b9009b55 SHA-256: b380e139ef7a3d85b1544789271fab2cb8547398ccf1222d303d370c0112b5ac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://terminal.hr/userfiles/file/75041506678.pdf In PDF document text
    • https://parklanehotel.asia/userfiles/file/jitaxugutivaji.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/46722180055.pdfIn PDF document text
    • http://boxethai38.com/upload/file/73880112917.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/64a8d7267c90ea534961fe8a061367fa/raxugokeduwuguxe.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/29015747627.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/dogikeluwuseduzi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe455c1ae9---20938233654.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613907839d85a---lujaxatilenosuna.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/72702519310.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/85417840659.pdfIn PDF document text
    • http://boldogelet.hu/media/93269371687.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/40949389621.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/kemagugakiguginasuzoj.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/donoxefosewalamutonajeko.pdfIn PDF document text
    • http://teknis.it/userfiles/files/salowoxobapa.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/38358276855.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/gofewubamutawowonabi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c71106469b22d44dd795ebe4420faff0/62248902817.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0sen19im0tn1n0ee9pq9227bi3/delekunupomuwonarum.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a376edf92bc374beb5886f3110853b6d/30000734368.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/loverowiduvemoboxe.pdfIn PDF document text
    • https://membermimpi.com/contents/files/72765001829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=construction+sim+2014+mod+apkPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 17428 bytes
SHA-256: ca417e10c81a27b94e31d845e32728c9b65f5254303f4ff61a55f91059a255c7
font_01_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 11092 bytes
SHA-256: 4157eb37e215232bc860eb672b727a70964d1fe719c7a151651af405b02c3378
font_02_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1