Malicious PDF — malware analysis report

Static analysis result for SHA-256 890ac244956a42d7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 00:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0dde4d34cb8c1bc6edc2f702cf57094 SHA-1: b34c06b95d15082a48832732c4efb7bed5e32c8e SHA-256: 890ac244956a42d72cbce13cd0dd76720e2fb1990e6d15de7d256aa7414e86b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are used to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/5508889b2029adcc6ad8463d7ab05d5d/kabebobuxaker.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f9ef94f---18732880246.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/82048567412.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3ed6623f0d6662e158d38d5e7ff23dc0/dematititedozilubatafa.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/fagefu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bebudogowo.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/57254c94d10f1484db3d77804873c2ef/xeguvowurawowunafe.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb80dfb06f6---vabivopedap.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/39928559854.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627244342.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d0qm370dnovftptg810dob58s5/4769646419.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/69024931006.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f81139b2---83039703341.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce95b842d---kiwuganubasalibirip.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0116ac669---foparamaxa.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/kudafelavijamexuw.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/pijebimitavulisalamu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/10116130726.pdfIn PDF document text
    • https://85097781.com/upload/files/26969496480.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/54586025171.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/voduwod.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95d3f2b18---68033555624.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/gezoxinokeninawiza.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a213bf89cda---fagokodawelalo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kutixupitiviwexovovanafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ricoh+copier+mp+c5503+manualPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/vazulufopaweb.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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10948 bytes
SHA-256: ada9367b3a743d0544899d01e858ce39239daa10ac0aa979731494908ae4e91d
font_02_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 20424 bytes
SHA-256: 304fd784ebc04c0951b3d2b85955e37ac4b1be7b551dbd2ff37705e572678cc4

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