Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d642dc7d83aa473…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05e01c03ac19bcf7996048f86795132e SHA-1: f48d7ec6da3ae6f2e94ed4d0778319db2ee9dfac SHA-256: 2d642dc7d83aa4732b9de9589cd2bca31452d21416c1417d2ee06dbf42115cbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=gta+san+andreas+apk+download+for+android+free PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3e9peg7ov9t760lc9jab077i93/41703794996.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/42644001175.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/jutenepewe.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/xozurusozivavimexazutob.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/59875375363.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/48781195359.pdfIn PDF document text
    • http://asqcert.net/files/files/99041792439.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/77263901620.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091306492473499.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaed382404---92421254198.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/31119944922.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/pigewu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/04afuci5i5b5eqil79avuh5sj0/60654406618.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/75635353004.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/dakilipu.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/xerugij.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/wolumufufavukabelamu.pdfIn PDF document text
    • http://htwy.com/upload/file/54017007170.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210913045412_7ck2s7.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bf9098063---36343175145.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/mamabigadagudamuju.pdfIn PDF document text
    • http://lactopad.com/uploads/files/15339340152.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/34407164421.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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 14504 bytes
SHA-256: d3d36409d996e8d637e001decdbaa5353ea1ce09b131e07c6b53a28d74b8b9ae
font_01_sfnt_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10708 bytes
SHA-256: 1f462d3d3e81824537087ce8d05fd7c9c612cad6cf8bfc91f967f830540b60e1

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