Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cba34aa4a95230…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 17:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f10fe7b23d19ef0e4c8598883841137 SHA-1: 968d959a01d43c6d29c64f781411b291a6f19b43 SHA-256: e6cba34aa4a9523024d960accf56a71a3d6080b682ffe10c04506784605e9f06
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the overall structure and URL analysis strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://alexandrapanayotou.com/web/images/static/file/98201410227.pdf In PDF document text
    • http://unsersohn.ch/images/file/wotavifowopixatujuba.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d8betq0pq5vos33g17mkrvsklr/7379575684.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140693f03cce---lululefunupoguwepu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/94900831442.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/20469333653.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/gozepetane.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/75366999451.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79671506243.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/rufujupiwipetalijinu.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/99333403812.pdfIn PDF document text
    • https://simorgh.it/uploads/file/muvudiw.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/14556649291.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/movetolugemujepewowo.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/43247948927.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/29619643418.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///borowivemuravitizuso.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d81fc37c8---53493082709.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/gatuguboromevefolebi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5d7066d7---1032452506.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10403471231.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/70724298291.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/54232826189.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/515821ab9ad6970e07aef5632404ea0d.pdfIn PDF document text
    • http://machulski.com/public/file/5598778115.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vidudifufolakesukelapade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=screen+goes+black+when+watching+videos+androidPDF 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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 11108 bytes
SHA-256: a03630a377ce54848e93aa648e94eb26405a7725469abc282c27083552bf9000
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 17112 bytes
SHA-256: 8010916df145472f7f6b33a43b48fb1d0d114e609a25c3088a52b8c002d160f9
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1