Malicious PDF — malware analysis report

Static analysis result for SHA-256 4940aebcf56ce826…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 09:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5a94fc8ec2a9483f403c8f97c329acf SHA-1: 17acbe7a35b68a4c28974f94a0db119f4a5e255f SHA-256: 4940aebcf56ce826d2064db9176768dd17f2f5a5bfede0f94fe91aa48b3c8c59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of JavaScript and external links indicates a likely phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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.
  • 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://squarcialupirelaxinchianti.com/writable/public/userfiles/file/bijixomitutinavil.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vigezulafisisenukela.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/lawolupunukepemowivube.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fa460d2510c0a32c582e569eb54192c4/kopiditili.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/lamelaladusalimexizexuri.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/7486952163.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0028d301eeff46f170a2275360330c27/85735162701.pdfIn PDF document text
    • https://allianztc.ro/files/file/ruzatosezulilokuxad.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610b685444774---fuwaradavupo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lolipabolufom.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c6f98f3ee3a21ddc51dcbb98db7c29da/nuroj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f906584366---58741895299.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/bewezelujewela.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/6237998823.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4aqggai21j0ualdc2bgid7to0k/gugisidonewetiputuvafa.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/73601909902.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/mazefawonu.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/15107752213.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/12065039236.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/jadovimufi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b541b936---nitefuziwipuk.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/mawegolukolijif.pdfIn PDF document text
    • http://bronia.org/userfiles/file/75553439237.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/litix.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085817e85fd1---85306684162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=electrophoresis+principle+types+and+application+pdfPDF 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_off0000b571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 10816 bytes
SHA-256: b68ee197d55ca92d4c3896827b1036e4fedfbabf0be937e40fb8d80aa62b88cd
font_02_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 14696 bytes
SHA-256: 7a2fd533ed85b42a02febcf9be48ff4ce4b6ed105bbd073c1a0732873372715f

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