Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c61c588d1e9b430…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 01:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cfb3e1453cea9d79197a18800366fd6 SHA-1: f8455a3199565c9840439bcbbe2841868fccff2e SHA-256: 2c61c588d1e9b4309f981fb5ea34a51613ade2f0d21ee15b4f7c25e3ab4866a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or are structured as link farms. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware. The presence of multiple compromised CMS upload links and disposable hosting links indicates a deliberate effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=verb+forms+list+pdf+with+kannada+meaning PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1d6f2641---52359839500.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/60088623765.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/17697154254.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b019118af---betuzijejajutepobesas.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/kewigi.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/45454844521.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b56001852a---59999092398.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/wopukevadixuraxenubanefuw.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nuranomijifu.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/16278715156.pdfIn PDF document text
    • https://panoramabyty.cz/content/97239601406.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5496ef43fcb0be1bdcf8198e5ff39a53/90604427548.pdfIn PDF document text
    • http://toroisg.com/public/images/files/31011713595.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24706952022.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/26265251562.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ab1950fea5a077d67b200f0d6397f88c/miposalopumajipoxibosisid.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/dapagineniref.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/20458395592.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5ae3e5aa6932850ac1c63ce51c1ed44a/12880885447.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210609222404292468jbkui0.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf52e066e---bezipe.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/2936003322.pdfIn PDF document text
    • 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_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 19308 bytes
SHA-256: 37d351b7b47da21dc14ccd357b7245f422949054eaf995d5ff53166f67ff31d8
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 11232 bytes
SHA-256: 0b49495bb5db53ee9316077746ea72956a09abae69fd665f04596b97366e2ee1
font_02_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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