Malicious PDF — malware analysis report

Static analysis result for SHA-256 447a491eeeedb2b6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 13:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78d3104d2fa874312b0a129c085efecd SHA-1: 11c49dd549b86cc1352d35840b278060b700188a SHA-256: 447a491eeeedb2b6422ae8341e7853c7cfb01291ddf751c82045343eae06de79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 https://krisoc.ru/uplcv?utm_term=simplification+and+approximation+questions+for+bank+exams+pdf PDF link annotation
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/icj0isp9537lu5t1ftpuuu1dig/newixatufob.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/bunuzevoxubasebexexe.pdfIn PDF document text
    • http://kechengchem.com/upload/files/40827231306.pdfIn PDF document text
    • http://tavio.su/files/file/71590213313.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c73557098---davidiluwade.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/26608445688.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082592083895---dazuvilazokabasuniletun.pdfIn PDF document text
    • http://www.ezmoving.com/file/6945695408.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1454ae20fde815d56797c184324e56fd/merezutezovobape.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608690b133c59---88660526060.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/nuter.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/kafasimakoretananatefa.pdfIn PDF document text
    • https://maturana.cl/upload/file/39177593397.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/lekovijifibozamatasi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/83d24941abd6a640733151416361a793/tomexerinodava.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/giwamujopewutegekokudebo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f740db8e34---37065799511.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/61408618590.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/lituz.pdfIn PDF document text
    • https://biocoils.com/img/file/31494274136.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/82878058907.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/46739243699.pdfIn PDF document text
    • http://rafaelokazakov.com/file/37372082865.pdfIn PDF document text
    • 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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 11436 bytes
SHA-256: 90c9051627057bd1d074f85e8bf07e38c6e0cf2566a8349c7a7ccadd92ca4ce6
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 18520 bytes
SHA-256: 5ab84a8a93b5f5d2e1adaa3e89605428821298af73fcd2509e30d4b49eb807dc
font_02_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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