Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddbd524245c4cd7…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 15:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de3a7b7ff629ca05c41685f22d0f7d9e SHA-1: 3b114cd16026ca98b8057e3a51a94b6a43c24dd5 SHA-256: bddbd524245c4cd73af774eac7f32b4d9fbf03acafad86c7ba25cede1ce4e36e
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 within documents. It also features a link farm pointing to multiple external URLs, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=lp+installer+free+download PDF link annotation
    • http://mp-hd.de/data/aktualnosci_imgs/file/6538159493.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/15293391277.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/deded.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/pofoleju.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390fa09e1ff---zedobet.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/42806217660.pdfIn PDF document text
    • https://bursac.net/userfiles/file/vumorakutozukuvosuwapap.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/gupuvakezuwiw.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/wirajimibife.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/lufujugigulux.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/15577440913.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/nijulofaximemiw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/c07h69c36snlkjekpk4ipetrvg/tabukawobaxifobomukad.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/dixuwaratonugeparovamus.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/41106060540.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/m01helh4v6bjctpjq73kiiv0b9/jopisudojamegi.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/61805156453.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/72139134870.pdfIn PDF document text
    • https://lorus.rs/files/10951720571.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/zosugigelukuxuw.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/lubasakuworo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/51371904509.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/lelem.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_off0000ae4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4A 10536 bytes
SHA-256: 84d5847efe8155dea69efa000fd6d34528caea7348c13dba57c42e6dbd10e816
font_01_sfnt_off0000c679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC679 17044 bytes
SHA-256: 82ee3b8e0698c90d8c6003f1e7786ebed2abf45c59fccc46468709193aea3d25
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1