Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3bcf68105379d2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 00:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e503ddb7feb5d087dc1f9d0d92c5051 SHA-1: 1e8b9c3c41ba5697ab3bed39a50671a989f8ecd9 SHA-256: 4c3bcf68105379d27a9a47ea7fb8189549aed2ea9e8a88d619f6bec104fe5959
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://karinbentum.nl/uploads/file/fukudolefoxotojenapolopes.pdf In PDF document text
    • http://colantuono.it/userfiles/files/titof.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fobofisirofu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef97f283d---fufufakekuwanusu.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/gebavotetaxekupobiwaton.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137deeb5a1ab---viteluzuloxetolin.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/xagafubot.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kutafo.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/39588124385.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/27s065b642cc8ekld2dhohjue3/lavoxidekefiwowazabimi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161378e87098c6---pazabimita.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dexavedezed.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • http://timocomputer.cz/files/file/79123364135.pdfIn PDF document text
    • http://sooclose.eu/upload/File/mokefulefisujud.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/saraxulasig.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/82090747765.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nolibul.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/kusexorofawate.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/57696387354.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/kuxejev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=assassin%27s+creed+android+games+listPDF 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_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 18360 bytes
SHA-256: bede2a031b157453f509ce034741fc98cb992562ea16127dd31d40f8f691bfcc
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 10728 bytes
SHA-256: 2b985edee315b9615140bb9ee79e7a723730684d875bb702f08a96c0220443c2
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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