Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a6ee5af5dd9ad…

MALICIOUS

PDF

91.8 KB Created: 2021-06-10 04:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: faef87b3bf25d9331f23211a80e6258d SHA-1: ecc242120d7a52c31aa318168230f6ba4e10338c SHA-256: 172a6ee5af5dd9adea28a4a9694cfd8b603bab815f9cd5963877cb3f35158677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=instagram+blue+tick+keyboard PDF link annotation
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0f72fdbd291df35f03d0dec4f0b821c8/dedumeluvonorupajavegufu.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/2459973111.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3143445e4---nigamuxofapu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1794d212bbed8602a853c5fa694abd2f/10949752371.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f4bf069900f2ada61973b3cfd85b7c20/metatosepamukefuve.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b60c99f8b---gikanujuje.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607591ba12243---busenubomosiwobimofadidi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6e2ecb6e87db4a7ac7fba9e91ac4b9eb/tokivalodanixewuxiver.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file/%5C/gudimakego.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/02a0a2af828616663654fe261ad1d1d7/nodalipo.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/pujunijali.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e096841c7d---sodisubibikigowe.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/al1c8gj2ht4b0et79k21dsbmj0/pesasinipivuvesawipudep.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wuwepuzefidorumezu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/61451798e0497fa07b4ed13a1c4d90e9/xewiza.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae108362a3---95603512909.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/11975780248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 6904 bytes
SHA-256: ebf3918eca2476107985533b50cedb4367ac6cf5f17a767d5e2d715087bbf26e
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 5500 bytes
SHA-256: 32b8928d410e8beff7772b7736974c8c4e89ad9b93cd264b42daa2d39e19846d
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 2348 bytes
SHA-256: c93bb29a91703fbaab59c715dafa893e4cee020fce8b62ffa45a670b6b6baf0a
font_03_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 11708 bytes
SHA-256: fa11a962e2d3e19f5bb1c931861caa5bfca99ea6f29cb39dbf9f22ca3285f947
font_04_sfnt_off000147fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FC 17288 bytes
SHA-256: 35afc283e51301b7c5b04ebe85740150ed84ecd680482fbe84cc58979d8cdd7f

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