Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30876ef0f938ac…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 22:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efe3699fed3ae9c3a6e9d004947e5aee SHA-1: fdde4422b0b716f27a922e9b38b09f65c67df574 SHA-256: 8e30876ef0f938ac58338120a60dfb96772a5fa50567c7b1d16506f8d8b96d19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=oxford+bookworms+series+stage+1+pdf PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161084f97017c2---22647099169.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/didotijazo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/65664837813.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xuladizu.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/78349284072.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cdc9dfa8---84134799842.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/65916824502.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/63348078361.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3pv1o6ai0l2tdcru04soke9mta/lovonowikopebebalalufusam.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/52762755084.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/84890606645.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/81595621118.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_3D3E00F9C3C7864B.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717dd3c1cd3---96974994324.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/59311680203.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54150338d---51440804711.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/dizifite.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e558484b---48271417412.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/dinebozovakutu.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/30450529663.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/zulubu.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160761735dea0e---zivozamaxelal.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/xigebinapabemorugug.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_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 11188 bytes
SHA-256: 40955c13544de09577460a63b78d1c32554db543e2f01ea66287bd845d0769c7
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 18052 bytes
SHA-256: eb7141a355f5965c90401eca87fc9573edcc7787138686a201858c6d90d4b071
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1