Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef5963750c6bbff…

MALICIOUS

PDF

90.1 KB Created: 2021-09-15 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97f7f8385d3635723340e7eb1aaa22a6 SHA-1: d32b1a7e8b5b2486c757e1be03d66027a88c415f SHA-256: 5ef5963750c6bbff2e22f5da9c827b0516c1f03783680e89d061abe27d1c8a21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external URIs and link farms, many hosted on compromised or disposable domains, suggesting a phishing or redirection scheme. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://queure.ru/uplcv?utm_term=free+online+tamil+movies+to+watch+now+tamilrasigan PDF link annotation
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/15741812400.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/10130512734.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/780ee9b8dfa1f343fcbd5249659d32fa/joxisuf.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/sotezotebisirotobivotesuj.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/rutifeb.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/40704532704.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/vezakosasi.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/nazunufolofegeximosasama.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109140329175371.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/52238696522.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/51517825265.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/zuxusoxunisuvup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/loxazejegupoxasogut.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/48551963748.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/52639321815.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/98744970989.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/36524001055.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/lomonixalanuxudibalime.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141102a73452---68870514095.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/milomovopima.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/fegobisasalubinumo.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/85857767632.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/69274448376.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/mikafegipilatu.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1843610829.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5d638767---nalesititimotorixigeteku.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_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 17520 bytes
SHA-256: 7452f02be90f303c0d953de1476125dd42697de8955cc3cb978af2dd2b95ea12
font_01_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 10808 bytes
SHA-256: 3d8b6d2741671c30cffb3e50a17d20856cbcb385643ba8f63d208e1fbb886225
font_02_sfnt_off00014258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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