Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e48b5a76df6386d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 00:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b3c905c1c714eadb7f960efbf734b0f SHA-1: c08ecb4b9bbdcf6aeed0a3748eeaf2d2dbbef07d SHA-256: 7e48b5a76df6386dac64cf89975ef4ee9b71f133a6f680ae9fe8d0daa411197c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded JavaScript, though not fully detailed, further supports malicious intent, likely for redirecting users or executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://alpha-th.com/userfiles/file/bonadubigawukijevamileg.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5952dc45---kemigiziwosabuviwuzusezo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tr7tkhhiprtrdkvjnbfre92lj4/24768176654.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/gagetokekibilaw.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/39d82718d23410b0afce927477138c8a/41569517220.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/visumiwa.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ir7if2ui9lq339eva2erf6k785/bewumigumixajisubovupiw.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/9996827034.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e9911724---fugadikobudesogekivonuwe.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/sutojedenikofudoxeronunax.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mezalikitisowigojotop.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609b15136b77d---89559939768.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/36444538996.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/77915192294.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/53751754567.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bde96035a2---duzagipumitu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2a3e460d191afbad5fac84af1f9780f4/52156420374.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/59690420436.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ecdc6c4e---82346482003.pdfIn PDF document text
    • http://schubert-hh.de/image/file/sasoxupureji.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8df06832ea---juwoberorunizifozovo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/68433313651.pdfIn PDF document text
    • http://raczcsalad.hu/files/48816428554.pdfIn PDF document text
    • http://jarosi.hu/files/file/wexewoponoxozarikazoziwez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mazda+3+2008+repair+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad2a54e21---85164114379.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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 10944 bytes
SHA-256: 56a4659bcc86ab0b53f993775e19598cf6bcc9d9b18603b8360089301745d215
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 18336 bytes
SHA-256: 82b2c7101aa41103356b308e51c817b70ca7ba9c7063b06519a4bf0e470b10fb

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