Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dadfad58ae96d9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 21:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 94e24d6d5b9e5df1cd8cfa7c9d01e790 SHA-1: ad9331d247ed12f724272b282fd26415441ccd4e SHA-256: 00dadfad58ae96d9b199904003b9b7fc89bfdffcf5e3ccdd62c8f0742e633eaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely intended to redirect the user to a phishing page or a download for a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=midnight+sun+free+pdf PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/91d41078848bb8c8e3ac5197045ed146/71822698601.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210909_10469A515AF80D74.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/86760805506.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/82318279468.pdfIn PDF document text
    • https://luminex.pl/upload/file/38458619902.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/piradofojipadugaludo.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/40306264547.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/12517678725.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/35193163244.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142345ea392a---damexu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/gabubuxarupinevelib.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mewewalodo.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210923124504.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/rutezumasiririxiwita.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/92382305438.pdfIn PDF document text
    • http://sksound.com/userfiles/file/1084801489.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/ferujitopasivolo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a0597e58---ribamavunumewovosarebilad.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/fevitogepezomivedota.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/dawonijozifowejewiz.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/39120361750.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/15799676872.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403b1a7ec47---85250892494.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/79040961315.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/birimivodemazogatuma.pdfIn PDF document text
    • https://casaalu.com/luutru/files/fakapoweluziwisatobi.pdfIn PDF document text
    • http://indemo.pl/Image/files/jofurumititawejubepok.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_off0000b32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 15744 bytes
SHA-256: 6a4c82463650c0def2c1b85d920d55afe91cda36e354347a26fed34654a4ced5
font_02_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10540 bytes
SHA-256: 8d37f8abcecdd2e38ea984d2c3589186f4971a6336eb03533da84f59aa664535

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