Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8171201d2550ca8…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 14:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df7d132b23a341e8d7184d459ac050f5 SHA-1: 97b3ee22dacb8693a0fce2408c6d555c53742098 SHA-256: e8171201d2550ca8bf83c19bff2186060fc9894e5c534968aab0fc07d519c0b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS upload storage suggests a tactic to obscure the ultimate destination and leverage existing vulnerabilities.

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f207cd517---sekifetomonipip.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c718eda6012---326424794.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f89621bce9f727d106826ca93f22b560/xulujesorewovasejopug.pdf
    • http://nfraccon.org/userfiles/file/48067685585.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/cbba9b5aa3afaed1f852a17b944e192d/90635804029.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/sapikonoza.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160796d5854127---82609567485.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780efb3fa11---84448846751.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e37534458---63448998519.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3824a36dd6---62500453536.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1c5524fe222b0eb3d7db3da45fa4f4cb/55653030439.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ffc2c843f---nixolobe.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1a29acb34ffbec54fc1f977d83a09cca/83063943403.pdf
    • http://kfbi.ru/content/file/51444694721.pdf
    • http://suarezbeltran.com/aym_images/files/zirur.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba67503b438---85113630873.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/06746f54c2896ee0faf102e43457e688/pegiwenoranudopeke.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aecfa3c9b2c---52676160821.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2238a3ef---97367541993.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/18929c9594cd61f9227bd29e6f25ded8/90102049217.pdf
    • https://jxloanchien.com/style/postimage/file/roxagosa.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a252aca1092---65371182614.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n5j8ruomipal33vvjffn0qfk2/toravuzugetaluzof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=perfect+cheese+souffle
    • 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_off0000f2c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 16792 bytes
font_01_sfnt_off00010ad7.bin
e35ff10af42740101014b5ad3286b718d18f6a46c007f475dfc44073e57f4836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 17520 bytes
font_02_sfnt_off000137b2.bin
f7c0b010fefd1afbf7f3803a0e7b4f725f3359afa928120f9b462162572afb9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 10176 bytes

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