Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c27d609ca3774d9…

MALICIOUS

PDF

86.6 KB Created: 2021-07-18 14:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a265c9101ce4947f00f72e1bca6b1d65 SHA-1: abe5ca99641ce949f25c373fbe8985a88c654000 SHA-256: 5c27d609ca3774d9f21cb6b0fdbdc812f93d6efe471ed02977e9625ec7e6c915
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of multiple external URIs and a link farm on disposable hosting further supports its role as a distribution mechanism for malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160984d07d75d9---54765191835.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/12bc3f55793ac63782c2065f52eeeea6/89373084514.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/92540792371.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d4d3606---86428585693.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a3ec9a07---nuwubodivotusuvi.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/m1gsoaqnh1n1qa2q7t5gnghhf9/47994863048.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072933b4a7ed---lelebolonekiwigifulu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed898ca11c---45180916808.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fogasijapijusipanotu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ca01615b---jowugovono.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/75880038808.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b252b692609---dixugabepenovumesodevo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be39da32a62---wepoparoxozuwan.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/10449800088.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609354ff12496---todunajimi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ee8b34205510d8b1747d307baad162fa/kusewibavimixufa.pdfIn PDF document text
    • http://fygl.net/uploads/file/081815133552.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3973d22542---vizimoverizetavisowede.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255910e68b---25425468904.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb639b52fa7---nufefokokiwujomizoma.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94eeea5ad---55507603986.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16226847941446047365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=external+sovereignty+definitionPDF 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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10796 bytes
SHA-256: b47b1c668acc6a1c07023928ce3d4dc287f51f52a744542b5fab784a51700b79
font_01_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 17072 bytes
SHA-256: 695973d043034de2f753f08cf0a4faf0240808cc738f16f8ce097b4af3fff51f
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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