Malicious PDF — malware analysis report

Static analysis result for SHA-256 536fc657c4d5e277…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 16:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c29c121679de68c87c37c5ea712be310 SHA-1: 5df6d7eb5c1fc79aff5a9cb28206d7e9ba3501b1 SHA-256: 536fc657c4d5e2775757c1fe7a0251d4ed8a758f826863e93cb7971160ceaf87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=corporate+social+responsibility+pdf+nmims PDF link annotation
    • https://cafemocion.com/userfiles/file/92317576538.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/revidavuzezof.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/tuwusowaresafudojixowodi.pdfIn PDF document text
    • http://fullx.net/files/meduvusudasimi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be8147016---viwivudaduzivokazik.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/96190236016.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/09792ce85961d6854875e5f896e42142/wegolu.pdfIn PDF document text
    • https://bnovum.hu/downloads/38035960549.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5cc122df1---13372025278.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/74c25d0cb7cd9ef5ac3f4039942edd9d/41268489978.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c8310288---vinomupegawarunodova.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/65420589913.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3818fa384c91cbdca6b6790db0bc4740/dijefiva.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/39672583722.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/ropisubumofa.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/64938200776.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b83b2ebd4---51085074307.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753b602bd30---sakowibo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zitega.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/wuzom.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/wedusodowafuratawufid.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc219cd28---senegefirada.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611afd8cb28db---40784176074.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e6c5ce7e7f9ca3b878a094bc80084a3e/65074331562.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/32921bdc3d114164bc144699377c8f36/82616798520.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 17376 bytes
SHA-256: 8b07724967ffc6ce65fbd9e377de2590dab981a95e6a111b665e00236831dcec
font_01_sfnt_off000116a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 11064 bytes
SHA-256: 546844ff46c132981ea22995de74922f650f9efd53a3ddec33aa22825a95cb46

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