Malicious PDF — malware analysis report

Static analysis result for SHA-256 591bb27a2ded97f3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 08:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76c082967df755743aef03d1108f98c7 SHA-1: 9b2e5255378587c8a5b92976c2f946c5b35b9fa5 SHA-256: 591bb27a2ded97f300378fc5891af693462108093d48df8e4afb2f1cfe28ab36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=instagram+pro+app+download PDF link annotation
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/11792766415.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/78118855695.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/97704097252.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/72125092671.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139d12cf3750---bemulasanuk.pdfIn PDF document text
    • https://btegypt.com/file/95495920097.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/89599266333.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/23726037006.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/pagazumufolojiv.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/28215520245.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/54776150682.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c7336e0---49911876185.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131227d22961---59613341019.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/xodureto.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/koledakerozak.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/patebutis.pdfIn PDF document text
    • http://devison-matras.com/upload/file/linogu.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/21322560761.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/94375425522.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/84169709186.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/zokenelopogatodugivumo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/62980310745.pdfIn PDF document text
    • http://generaldistco.com/images/file/40900524083.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/63792400957.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/gupikimusod.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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 10548 bytes
SHA-256: 0d7fadb48188b51a8964770af87920e753cbd6a9f4335a49e143dcd9abfcf1a5
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 17524 bytes
SHA-256: 6c89914c479f41470fc0d623d1de84ec5b03f140b1cdb94211e93cdde0f6c0c4
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.