Malicious PDF — malware analysis report

Static analysis result for SHA-256 07539d24ffbd3eea…

MALICIOUS

PDF

95.9 KB Created: 2021-10-06 20:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a6b06883335ee4a790fa5502db3f64e SHA-1: b596fefc5e87fdd682d5dce54112ab078537557b SHA-256: 07539d24ffbd3eea6fbf89d8b15191eddc610f39f94d4c48e82f2dcd30a68500
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The document also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. The presence of embedded JavaScript indicates an intent to download and execute further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • 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 https://angkorphotographyguide.com/userfiles/file/nedafujovijiduga.pdf In PDF document text
    • http://studiocastigli.eu/userfiles/files/kulezexutavojad.pdfIn PDF document text
    • https://paperland.bg/uploads/file/dalefigivume.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210914103815.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/sosejovis.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/1719822788.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/15109428143.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/13886609867.pdfIn PDF document text
    • http://japhina.com/upload/file/63331827513.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xesusimarixadin.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/613908037081fc9c50036f79d73f45ac/89976680645.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/segubowalutiwuvojemoxodex.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/38666047869.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/28287731160.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/jobasamegizumir.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/masirozusuruwi.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/21848183844.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-4/20210904224625601342.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/95013982000.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/bewafomukonilokatobob.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/59218064750.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307bc54ba7d---nitamilemifox.pdfIn PDF document text
    • http://strandedtattoo.com/file/93234472166.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a331ba1b---87024566681.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/13695113017.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/58758950561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=abominable+film+streamingPDF 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_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 20420 bytes
SHA-256: a8526fc6cd0c144f94ec4257707b6ff30328910e5c0a218bccaf5c58edcab514
font_02_sfnt_off000159fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FA 10680 bytes
SHA-256: 11c1c7b95623d8ab869cfad8f50105f70010aa830dc03a4355831d48cef7132a

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