Malicious PDF — malware analysis report

Static analysis result for SHA-256 2537cc2247e163c9…

MALICIOUS

PDF

67.7 KB Created: 2021-10-08 09:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aff563f7efcc7bf9756dbd5fa5ce3c25 SHA-1: 20b5736fea78b10314bac5bbad4759f2664a4040 SHA-256: 2537cc2247e163c9a03f49796df2a044cacc5da845de8aa4d21e4636ba5ccae1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents a screenshot to obscure clickable elements, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=central+committee+china PDF link annotation
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091413071480554.pdfIn PDF document text
    • https://mklaassen.nl/images/file/diwewi.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/vafovasidutiro.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///mapabasokawuvuwafusuz.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/71666371337.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/duwevegunulevi.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/muwora.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161458cbe13474---75887390093.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/8135859019.pdfIn PDF document text
    • http://vpsystem.com/files/fck/pazovefalewiwubezuv.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/gesotifixetu.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/koguwolaxek.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/88009097659.pdfIn PDF document text
    • http://mcutech.net/files/3133100047.pdfIn PDF document text
    • http://xn--80aggmy8c6c.net/UserFiles/File/sivodinugoxakub.pdfIn PDF document text
    • http://hkacca.com/userfiles/36107384226.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b61bc9038f---72092998182.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/828f5649b37e2af5d6cff3c57050421e/joninapobiluboxoduf.pdfIn PDF document text
    • https://fivetc.net/uploads/files/73698633868.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/juworezejatuxafesu.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/92527837940.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/9699500582.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf134ff9d---45693114525.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210912_9C836FC491BBE9E8.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_off0000b00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00A 10360 bytes
SHA-256: 7262cb5e90e2c0b7683cc29e7b1eae119b1501eabc2668dd96267068db0a0b09
font_01_sfnt_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 13960 bytes
SHA-256: 61fa09bf6b6ea6a04d23cd6257867c4329487b85904338063dfc3f06cc5320cf
font_02_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.