Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf86d2621ea28e0…

MALICIOUS

PDF

72.4 KB Created: 2021-10-14 00:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 463f653331b2d48fc18b11ea3678d14f SHA-1: cb75d54751e661d5fe83666566b18dfa8d82d996 SHA-256: dcf86d2621ea28e0e85d95ca32abd62a718127e9832908d5e78a8b3f720a96fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. Heuristics suggest it's a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious content, likely leveraging T1059.007 if any JavaScript was present but not detailed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=ganapathi+temple+near+me PDF link annotation
    • http://nakamurasangyou.jp/app/webroot/uploads/files/48108626142.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/74333776736.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161607f52ce8f5---zukamirusewulupupegabi.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/63432755573.pdfIn PDF document text
    • http://airzo.net/userData/board/file/jogapifelex.pdfIn PDF document text
    • http://wohingltd.com/userfiles/losilowid.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/86537191248.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/dimaranad.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/56655067057.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/89d7c7c2ba0232d79ddef1b993f55603/59087406185.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615975d918685---mubij.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/72351123026.pdfIn PDF document text
    • http://zeci.nl/im/image/87480764748.pdfIn PDF document text
    • https://zhansq.cn/upload/file/bufabigiva.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/widepavopejupufaxibidel.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/98640765888.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/xipep.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/jarufuzowesaziv.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/kogumunalu.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/11873016089.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/67192516627.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/zepulijejezor.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/61897918921.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_off0000b8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 10268 bytes
SHA-256: 959ced9ac9348e895a61a04213d4a7e9e8909f32bd3d6ec4b972a8d6cca5523c
font_02_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 17332 bytes
SHA-256: fb17c5b5c7ff2455c55208143ed388a31a5fb184004da92003e828b7d021694c