Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e776d67a8c2c709…

MALICIOUS

PDF

90.8 KB Created: 2021-09-11 22:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99cdd7a6b93f3a4a4e3d61cb5dc7c4ae SHA-1: c42f596651b6e7b9a13d6ec86bfadf17f6f8f58c SHA-256: 7e776d67a8c2c709aae3090009b3d1f9cd554b9e66d982c0770ae28d77d344ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://luchetti.it/userfiles/files/bubekoduwebara.pdf In PDF document text
    • http://career-id.org/ckfinder/userfiles/files/51491185418.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/63027931473.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/vufixoruxukawoxuzogisu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/65479564704.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/64154187255.pdfIn PDF document text
    • http://fkhd.cz/data/img/54022019976.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/19713049869.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/dolunisi.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210907034401.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/52696810805.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/61554216394.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d15fgt2ldbujpi00kt0h7nofi6/muxedalemuj.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/seluberofatipixujajotak.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/16679128873.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/vemategap.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/1349313859.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0b04d75aca6b226db071caecf8ee3520/zonosefavarevejis.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613135a806a76---73272596700.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/tinigukevaxilobibomigo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/kuzefufadizivilejijet.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/86836690281.pdfIn PDF document text
    • https://mkontroll.hu/File/ganijigiba.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/44575755898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ethos+eros+pathosPDF 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_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 10088 bytes
SHA-256: 8936781ec19b062ef198f856ad8fdfc0c50b31e6e4cff7a23c86aca61f3533bc
font_02_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 19044 bytes
SHA-256: e7c48a8655d153ac005ca5adf7cc5f4892954b94b547d4c8d6e77b3ef368e12b

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