Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cfedce4729c1d2…

MALICIOUS

PDF

70.1 KB Created: 2021-05-25 21:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 68784263fc00c0adf5def0716c738cbe SHA-1: 8d362406a110f29a17baab7a9355b31abe7ab2be SHA-256: a8cfedce4729c1d201e2752d61622941204a9d470711be8a13e638a2e1dd468a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/etgtn34rnkhdokd7mn6qhhmgku/zinujebilapawuninariwa.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/os0pnlnoc7tfs7n1u55u4e5j5l/lukagimatemezuxoraxifo.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/1dce1ab604129f1ec49f5d8a0d00e6cf/lagunajimunukakek.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160968bbee8726---varipivudagi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0ce429f1e7c8de73a2d9a9a26a153e2a/44566427752.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/im6kpd3vpao8pl00j2u7c6dmu1/wabososid.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file/%5C/fowebijuxawipokigaxopap.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5a05dd2cd133f8d890a32990a51b95da/19230305794.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3389ae605---rosidivevoxijunesekol.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tusitatitupilipam.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759cceb81ef---demipiratikis.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/61e6ef4f8e7a35cab56db2e347938b15/tolagavazenotu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a6fc907357fdf9f66a83ea8109918f28/vufafubukexiniguwopojab.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a30d98252292d3547303432b94668160/xujibijasarew.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa323c82---velexusoridasolupabizujig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+the+keurig+k+elitePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 4852 bytes
SHA-256: 31f964e09a7de01aafdee6ec9aa5ed93cf024a27353264091c1548d2303fa1f3
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 10836 bytes
SHA-256: 11364e857d3d4aeaac8d9cdd6c322c8738e966e9e2da498e82f49551ecfbd4df