Malicious PDF — malware analysis report

Static analysis result for SHA-256 27edbc1c56a63153…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 10:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba887611ad10572e94542c29360d5fcb SHA-1: bd756d71da49e677ed4b6fd59d42035e55bcd36e SHA-256: 27edbc1c56a631538ae70772f9b75f8ba3514ce31d86f457aa8fca6cf56fed0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The numerous embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document's structure and content indicate it serves as a deceptive lure to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://bygreenpure.com/userfiles/file/35329561479.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9102ffbb13301ae607bceab229bb4e61/vowuluzejorabetelut.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/46081034530.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lavuwakapa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o47psnai55abngullcjbicke42/66022726376.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rev320dho3i9hhrqpo6pqmbjko/62960630370.pdfIn PDF document text
    • http://jarosi.hu/files/file/pubise.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9199b94749201745dd638988d21f77bf/89939157516.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aecdbf80b6bf6e49202573dd1238c1d0/meforevagaruna.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71c82df7d---88809747509.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/21118104948.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210515001102_e6o0oy.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/rirarifizodijagora.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a674ce531c---bisoduna.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102e6aabcbe4---bewadobasaxiwagijage.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/15509873241.pdfIn PDF document text
    • http://faradbox.pl/files/file/jojizut.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/80959016629.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/88778322019.pdfIn PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210622_D25FF0BEF2275859.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/64155126394.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/khheq6ilqe6tjessmq8grfr7v6/kuwikawizuromefesiseti.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zexikatobusuzeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=metronidazole+and+tetracyclinePDF 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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 17408 bytes
SHA-256: aaf8683fce66d8780b82fb46e309d1ed84f4610eb5e6d5028d6091788bd1e908
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 10360 bytes
SHA-256: 609877fdf88858b4427e17343c360312bfc0348be16ed293ee1ed81534545140

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