Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab499dc7519efa79…

MALICIOUS

PDF

95.5 KB Created: 2021-09-23 19:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bbc42080301ee44dcdd7040117d2d1c SHA-1: 7443a504a19fe7a12c52090d55f31ed8be16285d SHA-256: ab499dc7519efa79740da973dcfffd615ec96b640300fc26afb428a049ea4173
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pixomot.ru/uplcv?utm_term=instagram+followers+100k+app
    • https://arteziano.ru/ckfinder/userfiles/files/73086774159.pdf
    • http://jinruily.com/UploadFile/file/20210916164939113.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6d35f335---12724880439.pdf
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/52303074339.pdf
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/dalogixokorasituvaneja.pdf
    • http://presssimayeshahr.ir/pic/file/94432255757.pdf
    • http://bimbrlata.cz/UserFiles/File/lezapusus.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bbe0c16e---fanegisite.pdf
    • http://extintoresorigen.com/images/editor/11104847209.pdf
    • http://doanekeyes.com/userfiles/docs/86489631909.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/73142192257.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/72912634436.pdf
    • http://sxsasa.org/images_fck/file/1630924668.pdf
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/83070275514.pdf
    • https://condominiovillage.com/userfiles/file/42539372939.pdf
    • https://12tiga.com/contents/files/vojorijanugapefuferugex.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51977562154.pdf
    • https://mk-sito.it/uploads/file/15086681238.pdf
    • http://jiji.pgo.tw/pic/uploads/files/60369338518.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7b9b7c51---95078533899.pdf
    • http://makesomenoise.hu/upload/file/wifalemanesujuwuvej.pdf
    • http://sangjeom.com/userfiles/file///55905935464.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/gukavaviwimo.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90b00b15---nogifazadowavisikidadexo.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/65071668721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e05.bin
d39f073223efe8803cbbd12a2bcd285eddda97f0198e19c2f939c01e30f9bbc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E05 18744 bytes
font_01_sfnt_off00013ef3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 16792 bytes
font_02_sfnt_off0001570a.bin
72ab9797b34e9064276543c88e9f47bb2bb170541890b06b0c4db2440d4cec84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1570A 10912 bytes