Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8824e6ec5f7e85…

MALICIOUS

PDF

73.6 KB Created: 2021-08-28 03:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 807ff442bfebb1ae82c0ea51f074260f SHA-1: 5aa34362efa2658a3e9e467d5384d877b3d366bd SHA-256: 0a8824e6ec5f7e857f587f9cff59958b3a58e84ccbaf7ed20ba959d7b3aedcc3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the presence of multiple links to potentially malicious content is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://leadershipcareer.kr/fckeditor/_upload/file/binukufunuxalazemaku.pdf In PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/vamirasazimerimiduvogo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/63166576869.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/79734034686.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/14c676ae233413ca58ac9f041b93df55/dakofexonopilufis.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///mejavanuxifizanekenubuwox.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89459d0ce1---94106742843.pdfIn PDF document text
    • https://brakos.it/file/51409913583.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608018a89fc34---44346859824.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef54c0533---leroseres.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/34688862652.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70a56766d8ec162da21956ac0c6af716/vevedijotozetagelelev.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ad610h691d4jdiicr24pgkqqt7/rulosizutid.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606edb83c41db---52699140997.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kipimix.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e77e17aca---49139766637.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094357065d2d---juwolutijitamubumod.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/86524500618.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9834b476fe---wadusugix.pdfIn PDF document text
    • https://campermagazine.tv/public/file/1089179871.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/sixaxusagojar.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16282022141457170945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=red+prayer+plant+toxic+to+catsPDF 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_off0000bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 10768 bytes
SHA-256: 7f2d27b5835c14eb593d50ca8a500a1e2d5e299ac950a7ebbf82459a7594d610
font_02_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16832 bytes
SHA-256: ee4799a1736cbcdbe31c5d1b81fd79bac3faf5fc9524bf38910c8a9e5a10b466

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