Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6ae3f513d55130…

MALICIOUS

PDF

62.2 KB Created: 2021-09-11 12:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79fa19da54a79d0f440cace5505a6f7a SHA-1: 37c610d3df61cfb52fbb27bc06d371ec59660152 SHA-256: 4b6ae3f513d551301fb3c0a6443b62bc62627835d86acdea700b9a305a3a1873
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several URLs were extracted, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eccfd91e5d---xadawusefapesowunumogu.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161303153893dc---13732932918.pdfPDF link annotation
    • http://resheto.ru/users_images/fck/file/sajepuginogido.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/pogemexofepepu.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/71801803128.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/25459886942.pdfIn PDF document text
    • https://businesslife.com/content/files/jefugaxejojuwijiva.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i1lesc664okj3nqqiafuk6p0v4/dozowifukufevuzusez.pdfIn PDF document text
    • http://pactolous.hu/upload/file/43993683548.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/28514826380.pdfIn PDF document text
    • http://topp.pl/_topp/file/1917137184.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/79995996031.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/wapojikerutog.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/16785981892.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/508c65cb4973fcef4f1ec2a2dcc47901/xifebutewuzoropajibez.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/67052722164.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1c1733d5---84482360446.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/83524617029.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/debexukaresaj.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/978566e55574ade13a6eaf9bc15dba0a/xobilonipoxi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dbabd836e01d223c00664160708cabf/jexev.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/kozudisalilumadowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apk+always+on+displayPDF 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 10328 bytes
SHA-256: e9325953534cb020e3d6e17ff7c181fc58c33b3ce99a615494458f68a863a75a

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