Malicious PDF — malware analysis report

Static analysis result for SHA-256 af63836ea1c58bcf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 13:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7afc2c5ff2dd18d271c6b6b1970def2b SHA-1: 9c087c41ccc192d14be2f3fcee3dbfd459af0466 SHA-256: af63836ea1c58bcfa1bfbfd03684e644435e94b5517c65097c1b93414c85564a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed6e78d3c0---60042458114.pdf In PDF document text
    • http://ultraljud.nu/bild/files/pofibugakawofeneva.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/bebemopowaxarikema.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/sevotuvutisuju.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/todomomodarurarewirafip.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/puxesejadebudew.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7jl6isf8pjvmta14ihee8op618/fujuvufibefevegefezikeme.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/sofaposepubo.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/30965889140.pdfIn PDF document text
    • http://biosite.ru/images/news/file/60480096023.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nevugok.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/bonamiwawaguxabu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/25677912688.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/59298163394.pdfIn PDF document text
    • http://aprt1day.ru/file/4563502270.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/48421814369.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916111322783964.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16146059221d41---93299986185.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/gepiboruxek.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/zazavupopoxuwidosit.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/78212578259.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109070118519846.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/17873295465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=los+mejores+juegos+de+parking+para+androidPDF 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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 18492 bytes
SHA-256: 67c4987240b187b7c0e2bba4c0ee0e08280c60abb091bb31d51fbc7e76d407de
font_02_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 10868 bytes
SHA-256: c44999d7ba31a085dbc90da79cc1fb56c19a3fe0b42c3c55bb85b662ca41849b

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