Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b6fb7c1a78b7fe…

MALICIOUS

PDF

82.7 KB Created: 2021-07-20 18:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db8bf614e4db8c1491b4d6de0bd4a59c SHA-1: f7be0e408c7710395b0197ab1eb0352c4638a0aa SHA-256: 76b6fb7c1a78b7fe95820df405340f10eb8bc24cda5c128ff9513828290caa37
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/xejarebumovusod.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd9741ded---bavolazitekeki.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/tolixalekinetal.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/97343100492.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/gapisamotibalarowuv.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/56802458468.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/xobuxuvitoguzupuxagedika.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/kibuxosepuzofasedejewafog.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2cc75b4e---1930738501.pdfIn PDF document text
    • http://allycatering.com/userfiles/sedofetanokirunuwano.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071415cad571---39691088414.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/81734663492.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jafinutisisojulino.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/22603029007.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0597e742d---3701453072.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/07tmqv6g8vtkb9h5l2s27ms784/dusamisoki.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/69984f95207e11576235acb8169d31ee/95879178656.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d471a2f838---54749916957.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/19504799457.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/44028677818.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64cc4bdca2---36827833469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=6.2+inches+in+cmPDF 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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10228 bytes
SHA-256: 7b79e6b1422c76ca7df5b9988d2d1ed6d4d7d67a4bc1f359ec46a9f576683b59
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16992 bytes
SHA-256: b870944487ca42db1a53f5cbfe95cf89923c46034298cd5c7eb6f5269b68baef
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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