Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f7e0bc914e8c95…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 00:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67cb072ef02d8a1685bc3335970dfddb SHA-1: 7c143461ca28935df9c0c002371b472a6d4bf8ba SHA-256: c9f7e0bc914e8c954ba5a8fec0c254b9fa0db67e1021bbb7a9e8870229a11936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/01fa84c503726d9964cd82ca81341a66/gesuzisojekalugir.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a84uftpmvo7mhe3dmj1fee37u2/57789446849.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/51933611980.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/99553178049.pdfIn PDF document text
    • https://bem-sa.com/img/file/15403814923.pdfIn PDF document text
    • https://tavio.ru/files/file/41074070684.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e898728d54be627c54f6d26ddf17547a/bimadixifa.pdfIn PDF document text
    • http://altinay-law.com/images/file/selovogazazasawujimuwe.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/63113452117.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840730d834e---42092486230.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/jopugumiparefomagu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c947db9809cb839ff81aa158917ae07b/wepigor.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a0f013p2b27gqsr37ugqmtfj23/lekimosep.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/daicvmjv80qko1qa6f3uvgaqp1/33130639475.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/7010825244.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7b2d1291a388c51cf2869177a5cab5b7/joxesoboduwafiroside.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/8253934158.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bj32mengs434dcktmjdsdg4qv6/xepuliwu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cba7f7e1ab1af4484e97d5c1d16a86a9/11859991500.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7ab68d187c3fab9c86a3d42f365d534b/59597910738.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/bepijuworakugajila.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/tajagubasugurutasuv.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021625351355596.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848efae5be7---wuseviwuxuwabugu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0a839ae30cde655d92878a52f98bf74/57085125176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=articles+a+and+an+worksheets+for+grade+1+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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 15656 bytes
SHA-256: 431a48500dc674b56cd609d45cbd8f5613b0f70f7ab5edf7fb890503ec8ba4db
font_02_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 11108 bytes
SHA-256: 3aef34fcee55088ecdca171d55ed6eba598aad1b0c386a758d4f89181a051be6