Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c62d621bfe58a4b…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 22:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b7795b747474d1b155b8bbdd8b80e87 SHA-1: 5d1e5f164ba41b982395143f48499c186059fb9f SHA-256: 4c62d621bfe58a4b275e9670267cfb03e88449da4ab7f17445d45c630525860f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2dc7c1bb9b34d315fc5e3b30140da11a/61068206916.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/412c1f7a90d35c9b7714e651e843f7eb/78962942922.pdf
    • http://docando.es/js/ckfinder/userfiles/files/nidejutigewesilukala.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sbqdck95i6j8qs86nm2k90cq0k/87187886676.pdf
    • https://puppometalli.eu/file/26210225118.pdf
    • https://chp-travel.ir/data/file/48050546256.pdf
    • http://aarogyamedico.com/userfiles/file/saxuxofusazezegiruton.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3c4dbfb32c0e8705e3ed6e2c1032ba7a/56911503706.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea0cf0e298abb7b29c7adcc085f2171c/18095446951.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3d05c6fd04da0ea524202023cd21ee3/12607248861.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e2229b9bfe2926b8d72cfc2dfe48c0e0/31706092890.pdf
    • http://historia-bfured.hu/userfiles/file/botujugenivijipex.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5984b3f4a---19104905130.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f6d4dab89531f30fa1007921cf9deb4f/lunimezofen.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8ddd14bf---11664980534.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p1abpe35aod4ogs1dp53elk60/26654628981.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608244db397e2---tukiwosakuvosekapobavekup.pdf
    • https://abugfreemind.com/userfiles/file/29458657225.pdf
    • https://pioneerlift.com/upfiles/editor/files/4160347323.pdf
    • http://shukokai-voves.fr/userfiles/file/32840637250.pdf
    • http://xahscw.com/userfiles/file/66126216211.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/lu8q28id46culdbs8sb0faua8m/83360794880.pdf
    • http://nedirajtebosnu.net/userfiles/file/61868207870.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=feed+preview+premium+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece3.bin
b63a1a42ad428f918364b0dc6ef6fb28048d930e3b1f1bc55d2a76e329ce7258
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 22620 bytes
font_01_sfnt_off0001264f.bin
e6c4ab4d7f3f655c052a1be50a7a4cc8a91023b88521e353eef2995db4747378
pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 10340 bytes
font_02_sfnt_off00013daa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 16792 bytes