Malicious PDF — malware analysis report

Static analysis result for SHA-256 461f5fb8a7a7e31c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 18:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22aa49d9cb9e96b74d567ffd9089a9ca SHA-1: 820e7085f02e9fe6189bf337205bbcaf205530e1 SHA-256: 461f5fb8a7a7e31ce0029d9d28c5e05e39256ba51920c18ce288b09a45bfbd03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. This suggests the document is designed to act as a link farm, likely to redirect users to malicious websites or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=what+is+isoelectronic+with+argon+and+neon PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fc7aa248---zobuvarebutawejos.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/15647542113.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4cqao3slus4vifanmc5p708poh/sixuxesubirukado.pdfIn PDF document text
    • https://eventaipei.com/upload/files/2870866539.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/livobosexisuzawis.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/42863111632.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26d4699d9---nasilixikul.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/92470403319.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/mmnreuitpkb1hm1eclcfh94416/guluwuwimokawisajife.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/8945834581.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jagofolonanad.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a5490f71---56096425792.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/okm1rnorfpjqq1c4bja529b6bb/xedalopokeposegeboraja.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ee102a1b269928e65fe89bbe8bfd6533/wenagorala.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/dodasorafisuvololorala.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b698293d4b---zurametedezemoxajinif.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/podosajatap.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf1d4251a---50204665635.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/32461037444.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3a7cb2e59cf432d14704b9b0b8c3217d/kutupilanujafedazutipov.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vewexumuwaxirodigim.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/38637753257.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/bapawizipadorobukeruvolu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/91245e1eb49bc96e765d104953e99524/40516249903.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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 10728 bytes
SHA-256: f09f63a315f678bf9a124c31edf6279a2b5e5c207b250896a59db26cd83ea5b5
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 18324 bytes
SHA-256: 6623c21a4757fd5bb61a971a992962c1d4352db021bd637289d1efc799a771a7