Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f782217b93429c9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 17:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d997bf5e7d2cde01219154a926753db7 SHA-1: 50cd37f2f3629155216ea9a4574bb3429032a663 SHA-256: 0f782217b93429c97d5461b217d55cb2450ee3163af76bcc44f74e39a0c72fe5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple URLs hosted on compromised CMS upload directories suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c60548ad5b3adde7b1363e69f7bdbb7b/78926055012.pdf In PDF document text
    • http://dichvutot99.com/webroot/img/files/4760786712.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096599a68c49---93029444035.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/21282993862.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ladetemegawi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3c2ee2c7284b94c0c7870b5169fd1cb8/79368844700.pdfIn PDF document text
    • https://777mto.com/contents//files/9530729511.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/55820123184.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4222e6dbdbae170e473b0787552fb326/todop.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/sewikaledulakukuter.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/nmvf560jb8rahloro70e2lsaod/pafobevetagobibalogomidos.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/96777117996.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b052e26b942---67180322180.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e45829ca8---84260506184.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e831ab3b---kelevugunapexemakatolon.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f068e827e2cb8573c454c77588ce9329/50292576553.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/jaxajurir.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/13363879496.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gogajitokojewi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92079753201.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/11954792909.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n64nkova850368ldh1itnmm43g/71551333353.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/76073912565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+develop+speaking+skills+in+english+pdfPDF 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://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_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16928 bytes
SHA-256: 6ec4173f543b9d10b4868b432205428d89c7e16e8ba14abfb5ec6657fc878a57
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10912 bytes
SHA-256: e51f93d78d7b6c2e8419b4eb296b9973015400577c968fa17be51b611d5aafc8