Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d12702c25819d2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 07:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8dda6493d6d3a9821d4345ceb3a319dd SHA-1: 040e564b6d4a328f7beeab5976c4897f71051476 SHA-256: 72d12702c25819d2efb6ab5b38cdef080403e8d09f74c0551a86718c968bf138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/deaecd1a335dc363d0670c69e201ce1f/nolenegig.pdf In PDF document text
    • http://leebyenghun.com/new/upload/board/files/70709571237.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/vifarolilitimor.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210913152405_697264596.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/43537022069.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/gufojajilabisakomolu.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/31941227490.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/83917997137.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354e6767624---kififa.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/lunazi.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/32704182729.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/10596179806.pdfIn PDF document text
    • http://creationart.hu/files/file/pekopa.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e531f82a---41972350573.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vavulumidonetopapa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a958b972d---29538867661.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/56309459787.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/82995647574.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/72652749273.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/1158660394.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/98856311803.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jalevudures.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/daxawivogifaxunarubodebus.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210910015740.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/15822693047.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/zojuguduzisofutaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nice+describing+words+that+start+with+dPDF 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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 10804 bytes
SHA-256: fdfbd2470bde40db7ccf572c54b583cc68c6171e079bba1ba26072db3cdbc39a
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 18384 bytes
SHA-256: c2bb21f2dab9112f0be39cc55dd3bbe8ac62879af9ddf00724af3e8f156e5f88
font_02_sfnt_off00013b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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