Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be40d0c3cd1c8e9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 20:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 314e3ef7f99e49add88cb8e45cf5bfba SHA-1: 36f5e0286698b39e6ae09a2ce06a78536eb28737 SHA-256: 3be40d0c3cd1c8e9971a457ee387ba3aa30d79f2c2e56ab95d8ad143dfea91eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier 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 0.9977

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 http://www.velkoobchod-man.eu/ckfinder/userfiles/files/13180109170.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c199176---patejalezaseworifenol.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/50463327489.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/59309412583.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/24169127894.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d091d461a---konefaxakiv.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/labazubawopi.pdfIn PDF document text
    • http://turatabor.hu/media/66650050379.pdfIn PDF document text
    • https://spyboarcams.com/files/99361460661.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/74044898300.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wukiremawitipaxevav.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wodukazoxabudefelo.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/49051675770.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/17682727400.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/girapubukoliwe.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/tetabekuvilubudegixojopo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49f6eb6a7---sedasebapejuxumapawozib.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/zudosopagopeb.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/sokenadejifubanujejutonin.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109070037183690.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/tinapavobawofitijosovuf.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fawevapevixomoboxewak.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/64639705781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+on+windows+phonePDF link annotation
    • 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 18280 bytes
SHA-256: 1110c07ca967cace46f4712dbde19f7a3a96885497ef98af04126f19010f03cf
font_01_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 10248 bytes
SHA-256: 7d5141ab156e82b06fabde58ac9422b63a410bd219976be4e9f65b27f6bb8ef8
font_02_sfnt_off00012daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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