Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4daf5324c8015e1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 07:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1777135c64addeada39f80b175014b5a SHA-1: b514d29092f0775de6d50b3a9ed48e22f63f887f SHA-256: c4daf5324c8015e1c4a2ee0fa49840d47f72b46a0e5fc3f1edd6e5d4065c8bfe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, 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 embedded links are consistent with techniques used to deliver second-stage payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kawanmto.com/contents/files/talesepike.pdf In PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/sikapavanuwilomuvagefaw.pdfIn PDF document text
    • http://mutitar.com/user_img/files/64548402177.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/91029584101.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/30335027905.pdfIn PDF document text
    • http://congtyvima.com/images/Download/zaviwodi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614317ffd18be---31015245105.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d88e39f73e7d724ae87d64f8a6797a5d/juvunakibojipezodase.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/58781045411.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210912_CECDDB820CEA6E95.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/o7d96jtdpu5nbn2s1dfgdqor05/pirakibuvepapemivizu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ac818e8b---10583149937.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/kukavomazere.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/17799822715.pdfIn PDF document text
    • https://12shio4.com/contents/files/rajababe.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210909055403_ngcfua.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090402073973970.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/29254542952.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/5227535551.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/mojefimetoboda.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109121414260513468cf3v.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/55738364246.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/gopukot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=deep+learning+for+programmers+pdfPDF 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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 10744 bytes
SHA-256: ba65b826ef56e60438bd47f67a1802a2c2563543ae87ab09835bacb34b14850d
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 17856 bytes
SHA-256: bc51c3ffcf88d78afb85998f3751661d602dfa48eaaf0af202dae02f967f573e

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