Malicious PDF — malware analysis report

Static analysis result for SHA-256 792efc3a7e920def…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 12:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d930bbb7d89c9877f5f11ecc7f82c37 SHA-1: 3f7ce48bc4f56ea93e2773cc03a2b2e1e145dba3 SHA-256: 792efc3a7e920def4fa41429e2a00fbdb1914447fccad04644d8ba406f391160
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for further payloads. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f794b0eb7baa88cb36b14179f82a507/sazoruda.pdf In PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/66742820837.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wejopozero.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/derovogumugavepeligozitu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/10271832263.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a68d6d0c0---zajuzizaxefaxaxafixaxi.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/4863359589.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f6e74348---52706400535.pdfIn PDF document text
    • http://zuche0551.com/upload/file/sexirak.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/buwudeda.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/timosoxowojupotatebumewe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/19lmhg9jj3l1rq3ph2lkr62ch1/rorazop.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40583546041.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da739db82f6---kutuxefumevusijaluden.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85276266470.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/sizazewavajiganipuk.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079de46a24a4---86548433717.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///vadorixiginexoxawopew.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a52d3a15777fd9ab647b535e2f0aff07/96186991837.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eeb01aad7---12081057182.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/48842946065.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/59935243032.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/98477269101.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21c74852c---xukogopenadedaxonisas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=online+magazine+download+pdf+freePDF 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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 17004 bytes
SHA-256: f335eec155da282f8a435fcaa2f4fb742bed1f3807544a1ee517d0c70e0f6898
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 10744 bytes
SHA-256: c5486bd875234108a5ad223c5e8438d9166a5ec1a89d90e045a5e8a6cbb6b2f8

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