Malicious PDF — malware analysis report

Static analysis result for SHA-256 132a14cc07d98059…

MALICIOUS

PDF

73.0 KB Created: 2021-10-23 08:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d7ba8b8172c6076818714d53149cecff SHA-1: dd7e60366b8df37438ef1cb55f713b01a0be8cbe SHA-256: 132a14cc07d980596e4602ab7eb1d2e2823f7177a10d14dfa6650e972b62ce75
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external links, some pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kolaykanal.com/userfiles/files/75234786738.pdf In PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/xonexadinijo.pdfIn PDF document text
    • https://cargotavio.ru/files/file/75054728397.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/63486147362.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b63024aac1---42267372995.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/korefunetinewusifa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9b0c28425826238afc003af1906bfd54/14393475485.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/bivop.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/53113893285.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/3004227103.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1634662525.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/zanuwezovozuxula.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/disoxanozefevufas.pdfIn PDF document text
    • https://refurb.onlineconvey.com/In PDF document text
    • http://keacg.com/upload/files/wisedu.pdfIn PDF document text
    • https://27061010.com/uploads/files/202110130220078419.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/81356030512.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bopajapo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kocnr47em3ls6op4k3lvsqq4qf/kuwojaruta.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/renawiwiwipor.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/41463905418.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/xaxitexugobazafufigenij.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/wumile.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/28994168814.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/kilodikigobopemixogig.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/68978240010.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/39843833896.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=viewpoint+2+teacher%27s+book+pdf+free+downloadPDF 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_off0000bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 11160 bytes
SHA-256: 2e8975383fb4421b9f317d9f1cfc3439297b3ce59c8b228a5fa2486639141f6c
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 15016 bytes
SHA-256: aaaa6462f36b6b74ed3f44860814197c1bc1bbb6e7e0c44b00de943385ef3518

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