Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b20e32e1e85884…

MALICIOUS

PDF

83.9 KB Created: 2021-08-17 04:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1b2b8ebd307ffa3dd0471d542546adc SHA-1: 33e5125b4633f07d1df245f105ff6ee75407e38d SHA-256: c5b20e32e1e85884186fa0159deb2576ab771ee3c606c8e7fb3e62fa9f8f61b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://limpiezasinasel.com/userfiles/files/fetemupixuzoba.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/jufokazivutevagonuxizuke.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/gumox.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/sovip.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7a92ea134f4a817ad386c617feba0866/6112507141.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/098b36a20c61f044aab8b0b083eb9fec/87173527716.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/notisebukirokew.pdfIn PDF document text
    • http://emaaravm.net/upload/files/fapajuresoranize.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/vasonurusojezujedoz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071735378a82---gevoroji.pdfIn PDF document text
    • http://labsshop.com/d/files/vegufaxuzipekugudibir.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb20300c89---51049363473.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3be2bd9a---wabebux.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/57492031492.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1741f5d0---78982873155.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/82e3dc11cef89280b454afd9bd20fa7e/logobeliparizon.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7325f421b---59536233521.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7gdl9sd5bosnjqq4hge4ckov2/dikejegavatelexogatozeg.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8prs10c0i0uuqvcmnaeg2g0ufs/tasedalodex.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5ba895f82a7f44d5ced2e5281fafa446/fizozamunaz.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/56847299931.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/95816875251.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8019ff4178---20947923941.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/22se1gs5d38qm9ci63i6ghpobj/7268978901.pdfIn PDF document text
    • http://camwater.org/media/files/makazewefab.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb7b1b13b---48372416806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+gta+5+mods+ps3+offlinePDF 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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 11124 bytes
SHA-256: 359dd0b387f03696896bc06abf13060de4c4b7231c5abb4d0af0a572bc2fcdb9
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 16612 bytes
SHA-256: 90e2230971a087cc6e1d0ffe079cd2e6231d8d44159b6734ebf78e9a6b7e3733
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1