Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7e2401813e3484…

MALICIOUS

PDF

62.3 KB Created: 2021-09-18 12:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2239609c0963acdaa43710298837898 SHA-1: e33363f0425792711496c110d9ed9cedaf4887af SHA-256: ba7e2401813e34848da2985c3d0fb231941372b87674680c73424fd30f7b07b9
162 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 CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 6

  • 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
  • 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://saigonservices.vn/images/uploads/files/sasujofomusip.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/xogowuvaliluzemukoma.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gimidupuzurilogozenagebo.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/vevizikemaf.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/70830454911.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/97717626313.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d999fc5aea8574dc5614566e2f249477/2482323809.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091802530830.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/77438675319.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/73743566054.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/95784433381.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/lagezitejuvigosivekenuv.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/74074262414.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/81026964381.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/mukaza.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/53963862398.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/fikalomogadepigi.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/87337755743.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/24878524066.pdfIn PDF document text
    • http://104408017.linker.tw/files/37456055569.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9332eb8eea1375c3e46b9356cac0895c/bosafum.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3bfd8bfba5ab43e6849635ff4b776f7e/2038569916.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/70779885170.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/rugeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=need+for+speed+most+wanted+obb+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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