Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22396a9ba265d34…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 04:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df1cf5d0fd27120069348c6c1ad6e72c SHA-1: b65d4a6aad47f91368cb5c7e790a07f541874528 SHA-256: b22396a9ba265d347ae56e55f1fd0e76da59e140290b4353939f0f199a265c85
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://moristas.com/userfiles/files/33560369408.pdf In PDF document text
    • http://studiobaldizzone.com/userfiles/files/vutisevofeluma.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050303092673499.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16232435521236008986.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108071311391639.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada84865e2c---63276058199.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qqdfcahc6dh53n7lq0uid2iah7/90316024389.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24162958c---57013677947.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4492fd0be05b80763287b632ecb521df/gonujosus.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f3cva0uallkqtqc4veb9k3o7j7/13815588902.pdfIn PDF document text
    • http://altus.pl/userfiles/file/17426758262.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107051153511263.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fijidezavelajupojuri.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/qjs77t6udpp6uuni36n625ojh3/gutagaxos.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e496cd59ff---xilidoroz.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/niriworogozegodenikelefe.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/diteselugajozapu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703df1e979a---moredaf.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/vujitibu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/84359375187.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/44862744710.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/34245793504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=d%27nealian+handwriting+worksheetsPDF 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_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 17744 bytes
SHA-256: e5ff11fdb432151cf0446942e8d9a9853e8c10f562a221d0810e3e2f267e1d3e
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 10740 bytes
SHA-256: b739821e21a1006f5cb240b7bb85aedfed3a7a21afe82635ef83a840db792061
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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