Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed933653b05809a…

MALICIOUS

PDF

104.9 KB Created: 2021-08-14 03:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8e787558a31a012b57491971f05bd98 SHA-1: 897d78503ada00dbc2d5e75aa3a9e9faf58bcf4e SHA-256: 3ed933653b05809aa5746aff5badf9c0b89b83895e009b9f664955bb3eda4fcc
164 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://furniture83.com/upload/files/40009986387.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/99060254650.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e928ab4a---44534091495.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5477d69b8ce57f0057c860f2bd501ebf/gefuluzexefojun.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/38888517738.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf05cb848b---69449719949.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075fba84b17d---kadakifujepuxuxozum.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c574af6f4b4---fisasab.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vivesodadagalafirel.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31e0bc32c3---xegugikul.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/bafugi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609406f58861f---55026355528.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/71494300611.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efda74393---vosalugimobobakejote.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c1e30f5e6---zowanebigofawirusuwomire.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/b70dt5vtsejpjb9d9he9pqlra0/dowez.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e43d6c0f5---60137813523.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rezatenitajizire.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/93180231660.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/bofagututujosulozisida.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa06738a9---xovofuzofunogepuseziza.pdfIn PDF document text
    • http://myphamasia.net/upload/files/13958776249.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/zujiw.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/pafimonusopebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+update+piv+certificate+on+cacPDF 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_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFB 10640 bytes
SHA-256: 351e767f327013e10e29d48ade23ca285175d3bb40d61b0388742fac24584525
font_02_sfnt_off00016475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16475 18268 bytes
SHA-256: 28fcb4c3349ed8643639370d972f46c1f20c029e34f1e2cc20ba7bf421e71416

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