Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e6101baf704f9d…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 22:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 361b4b1b00da8922a90973e019644ac9 SHA-1: 3cb215332812d0313abf4ec771ccc2e2fd1436cf SHA-256: e2e6101baf704f9d5def65e28885fb0af444af345d02c4a21b5b47f0dc9becd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage existing infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vieclambaohiem24h.com/upload/files/63338260678.pdf In PDF document text
    • http://chandigarhdatarecovery.com/files/file/wiwafavafoguxe.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/77264518182.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcb943b00---ralimof.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160791e03ab684---delafonojubaf.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084944c92f44---1429859542.pdfIn PDF document text
    • http://canoeing.by/pics/files/24459571543.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af1316ac4---18131975666.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f2554c57101a4e7755aa0c2bc1170eca/86892479753.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d31c96107---wujipoposojogane.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/zofimelezudodav.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18285130790.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/80655322583.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b97b8c65---xivajibekeb.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078313ebc448---zikipozese.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/ruxisuxodomizituruxep.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/18217014785.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ed70570e65e2d34cef15d8acfdf1e90f/15032894113.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be7df6aa561---37510772836.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/17895782817.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/p18senkdb7sv5ltrng6hp1vs29/fewodu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8fce062m3sv0ogsjdfnpgoo7u7/mufisogepeziteposami.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d8a5e3c0b14ca4ed7db6e8fa8067cbf7/tiwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=line+up+today+matchPDF 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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 10636 bytes
SHA-256: 53fe0202a597302fc8d9b43fb6ea77fe0534f4d4c373e3f5f73e7a36e0d9d9f7
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 17712 bytes
SHA-256: 47f8168ca166521215ce101d1dc76379b30b704d85f0051e516681bbb561a2c5
font_02_sfnt_off00013b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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