Malicious PDF — malware analysis report

Static analysis result for SHA-256 428da3adffa8974e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 12:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34eca1df82b23817c0bdc66897276649 SHA-1: cb2b08ead5540584bdc9645a2044fa3079d0e6d2 SHA-256: 428da3adffa8974e403e8c03f4351ce0af256bf6df26798824daf0d2c7cfaaac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristics indicate the PDF is structured as a link farm, with multiple distinct hosts and a high number of links per host, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://avandcie-automation.com/ckfinder/userfiles/files/laputaxaxugos.pdf In PDF document text
    • https://cottonweb.net/userfiles/file/mekuvo.pdfIn PDF document text
    • https://latework.cz/soubory/fotadutubegifonipaden.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/18b965c6f1750d5fa92f5875fa9b02cf/rejefud.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/nadofosukozagizowubo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6049bf0345---21360599954.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/duderof.pdfIn PDF document text
    • http://pneusmarene.it/images/file/nixuranososukuza.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///suritebajefupexawomofo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pv78ova45m4auq64d7ccm4remg/nemujupujubeka.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/5567657994.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vue7be63d7j9f72j9vtldchs58/16573761807.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/jowipa.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kegakeke.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/30384621975.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/zibowopil.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2ke0r3ba1p9glifunoegnouvf3/zosog.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210712_0BB45CF31312DFE3.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21026363807.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6ca27c53531414957461a190530efea1/putapi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/vasinexalolupiranozav.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/88735292733.pdfIn PDF document text
    • http://rsst77.ru/upload/files/xujinawegunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=solar+system+worksheets+for+grade+1PDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 11024 bytes
SHA-256: 54c1f7aa3fc31de1501638d50baf5ece8f0d67f7cf013bb318094c1e520576b8
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 17588 bytes
SHA-256: 8d95072945592883686ad74fa3b0114fdea5faf49e628bf82ef451480dc37117
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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