Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edba0f78649e2aa…

MALICIOUS

PDF

75.8 KB Created: 2021-07-01 17:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 062afccc3577660990d92ed519dd2a74 SHA-1: 30c8ac56c39748183d5d427b2c8efcb4a22224d2 SHA-256: 8edba0f78649e2aa7f12de999562b8b76e732acef53b2eb5c5ccfd1d7aabfe13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or spam campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to distribute links to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://catamma.ru/uplcv?utm_term=size+of+small+room PDF link annotation
    • https://kompaspt1.com/contents//files/43422762635.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7dc1ce55---dufikopoje.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/54038c8ed9d04925f7db7ff1d83a237f/54294171015.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/beronukuwodofazadelisu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/nuberusesakig.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4ed0301f182c1ea1099a67bfef4c58f0/xixudalatobebe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4d8095c1---60233349533.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607544b1f2906---wadalenuxixiso.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3569e485d405258d882f8890e4e53e62/pajalukasevili.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d53e0917---jafomajozizomome.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e2f58460---jabaj.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vefol.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d273842bc0e1ac2b4605b36bcf63d2bf/bifazalimida.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/29380410981.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c0286e66937a3aa09efbefa7600750c0/sarojogawujizifi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e06c8aefab1b49c3e0658cccc3d6c156/76203602595.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437e18fe2b---79841824792.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/fizod.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad2b8ac2b---41017017473.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tt9t39aulo3g4ldjaoned45nd4/gadoselumitorujerugewudor.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ol4g2fnc528efagre7a3d5gqt6/lozetoxosijukenini.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088709cb1c11---46830590348.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/22492e84411b9d5a7a40f66cdcd6e6ed/31781513769.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/7608584894.pdfIn PDF document text
    • http://learningkey.org/userfiles/naduwelaxadufum.pdfIn 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
    • 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_off0000c99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 10308 bytes
SHA-256: b22ec77e414995ed931b25c346b9f9dda06d148bc2594e7f653a652c89720146
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16068 bytes
SHA-256: e2d4355d3ccdc23de6307f16a6755df107e7d05b41610b73610fac5fe91d8b47
font_02_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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