Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dce15e61ec05f32…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 00:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49c69860535645dde4b344e042271357 SHA-1: 3676a40553cca7189b2fcdff87f9ebd5b6e677d4 SHA-256: 9dce15e61ec05f320763b905cab7dc5c0861646b5fdca2feb0e368d4d24a54d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or social engineering attempt to trick users into downloading applications. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://huntic.ru/uplcv?utm_term=download+flixster+app+for+android PDF link annotation
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/74705566442.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed62394e3---fivupakuwuluriduju.pdfIn PDF document text
    • https://halkum.rs/files/88638319074.pdfIn PDF document text
    • https://webmenuplus.com/images/file/luxikaxokot.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/91371171126.pdfIn PDF document text
    • http://berbun.com/user_img/file/revokatexofebajope.pdfIn PDF document text
    • https://istanajp.net/contents/files/74986000016.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139678fac032---18558648825.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/35257309065.pdfIn PDF document text
    • http://evola.it/userfiles/files/9643789021.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/79444887939.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36962186151.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75ebc90a2---98436271536.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/nalobekam.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/95496461054.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/tusizidemafupatudedakizaf.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a01e4f01a24ef010670c72858b218835/53379911518.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///22022518650.pdfIn PDF document text
    • https://mackbeks.com/files/file/nosaboguzu.pdfIn PDF document text
    • http://kisito.com/userfiles/file/76538650097.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kakefofisez.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/90849920353.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/megogoko.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/68433841350.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/340231f54259d1b859deea7bd6bb8fd5/56254658808.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/99725889937.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091410384764.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81004336515.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_off0000bb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 16616 bytes
SHA-256: 3275468481b706818400153bfd6f97243bda9ff240c67c1f43bc0bd3b51b0e6a
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10680 bytes
SHA-256: 2113ef1e4f99277fa40943b85c8b90a1a8c82a86ed4f15fc3e4e8e98664684c6
font_02_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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