Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c3ff533715e6d9…

MALICIOUS

PDF

134.2 KB Created: 2021-07-08 00:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2a7aa79953da0223033c810c368a3293 SHA-1: 835501a001954358269d52373b415f6e13412124 SHA-256: 86c3ff533715e6d9a956304530b32c1573a120fcb43dff0964a3532d5826ac1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://drafthe.ru/uplcv?utm_term=one+piece+admiral+aokiji PDF link annotation
    • http://xboxheerlen.nl/userfiles/file/vewekopawe.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gevugeguv.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sozitipupefulijiw.pdfIn PDF document text
    • http://lblussana.it/images/file/befemunenuzuji.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a752941b04291ed34be237f3356e6254/78169202316.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/libus.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/83670007934.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c650da3366890ef0721c9079364008b6/81952915748.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/32229554143.pdfIn PDF document text
    • https://medtek.vn/storage/file/40658013514.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608869018bfee---48485546464.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lodedipakupimu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f7123f3ca367cb86dcf6d40245a23136/xosawovusubeko.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/39858321600.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/43679834505.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afffe6085a---zofukolaleb.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f94900d07---70891293062.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k8sqe6rkhqards06iqlb0gjjf2/76283427545.pdfIn PDF document text
    • http://pk.mo/userfiles/file/buvepuroderagate.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/77378048692.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608885ff64f78---24710512884.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080acee0f7a4---83683543640.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812cf4e1fd4---fobezotazisa.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/48352093840.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA89 17900 bytes
SHA-256: d3f8a68aaa0e4acb9b9c5326a509e5eeda2dffe10307f85b21ecf7223f3823a6
font_02_sfnt_off0001d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D953 7280 bytes
SHA-256: fd1660735b32bfd55500257a2593c61da090a25a388c384eb2a4c7533b75f09c
font_03_sfnt_off0001f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F249 10656 bytes
SHA-256: 992907cd764c86fac1e82eb174dfab66c7fff23344eebe0763bf56744590967e

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