Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdb97a093fe19f4…

MALICIOUS

PDF

100.4 KB Created: 2021-07-04 02:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4ac9104a61b0e737c4364b299889e1da SHA-1: f7ffcbcbb511b050be9bb49473b4ce8a29b2a13a SHA-256: 3fdb97a093fe19f4a93288c3f9c0f0f9ce2730ed978c311723c1120b3150c228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a40bfe36886fa7764ad8f71d26ea3eb0/gifivijulew.pdf In PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/39354983039.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/178154d242eb4e02b17fd9056668a7b6/72299851607.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/punemunidadis.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d675dd596---90581853807.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c344aa43504600dfb2a9943cfd3940f8/56901972532.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/jejomezikulimi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0a47dbaf---81881701666.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/60309510413.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d0c98656---60876847799.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xuradizovetebisovawe.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/36cad348b3587fd5441dc2b79b1e453c/66631402228.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/76db2528047119663b090dff899cae9e/65751711229.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210517/file/16212006101360.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fekikajanevobidobu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bvnccivd1nv4g9bcsjunsdjoc0/26008657057.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/52536781976.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/xexenuruxev.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/de33ad93da2f740894e947054ce9b82d/lasadoz.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2ca5ea51ff810c96a3bd2699e82ab8cf/53720905255.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6ac1b529---52087821195.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1e408c46---61935186949.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/wijinewe.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcc685208---13805977165.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/zuvotevajofatagisili.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/68062223764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=promoter+in+company+law+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_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 10816 bytes
SHA-256: 5f2d6906bc52cb0d018698143a84a1131017b95bf11e181ca2b6f2632c50d510
font_01_sfnt_off00013d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 17696 bytes
SHA-256: 0f3893b3d143d48ace5ab7c354649ea68806c8c75626c917e3dac4cb34ca7891
font_02_sfnt_off00016c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1