Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abedccf1f0121bb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 09:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b22d2d7b7d2e68f9f7a3e9031476e9c SHA-1: f5d77931032cd15894ed66d8c3bdbc2e376e6ca9 SHA-256: 0abedccf1f0121bbf4143e8df4e1111d8dad900e66419f0bcac77e3cce901490
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host more PDF files. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thefencedocumentary.com/adminfiles/file/61915419592.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4af4403d10ffe6219a695af189cc2aed/48742587571.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6c4f05e9---62847287734.pdfIn PDF document text
    • https://europartner2.pl/uploads/88578747197.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/62676503968.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/70869174361.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/22559271573.pdfIn PDF document text
    • http://webbuilders.com/files/file/jekewa.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/22077110302.pdfIn PDF document text
    • http://charivne.info/images/file/wazigevoza.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/zivamagokojotuda.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5bdb7afc---kokumuzewisumuparalizuz.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dccae382---davepakefeduva.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608679c38fb5d---tepeg.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3bc76b355ed3ddbb4bb140d51c7ae8d9/jusanatewate.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/dotoba.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/gazexuno.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/86601718947.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/noranolatuz.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863ff5912b5---7243520497.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/49018443282.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210815_142751.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/puzurekupojozanupevinu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8d64efb4---14727285236.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9ef6n659b6e91tnndmfb4408b4/wabakupenemepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sonicwall+tz350+manualPDF 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_off0000ca0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 16448 bytes
SHA-256: 1125992d8dc2461ff88056e513e2e8e0b113117cb42a9e43c931cc74482486d4
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10740 bytes
SHA-256: 52d3f5ccb2f42c55e9adce4d151f9ec48cc72ab25e7111e71b7c17c445fe6097

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