Malicious PDF — malware analysis report

Static analysis result for SHA-256 8153176de0209a52…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 04:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28a2f13b3c95aac96a2d9db668c8ea61 SHA-1: b6545bb72558ca8d24b583232769922241aef789 SHA-256: 8153176de0209a52bbf29bd9d413357618c7622dbec47c3ddb5b3fd439395730
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially malicious PDF files suggests an attempt to lure users into downloading further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a400c8bf921---bidilezojebudanuritirop.pdf In PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/jobugidivux.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/df35fn1ol4aca243o42j4n45sb/monegelupuwesoku.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4ab26ad00b12adee06b7771b6e920ce7/gupotoxidinakatowanug.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c88072ce9cc---mebogifefuliwuwe.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/loxisixip.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/63186259094.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/vilamovosopebosopulupate.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9326a84f48---98693909729.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/pesilifubutewutotexinow.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/gejijusurosevive.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/69823691500.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9951b30---44641329876.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/8048456386.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/guvagunabefanuzizevexinir.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a3dt5k9asvo71gekkj5n0ra935/30493663981.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/remobivomigakawinupe.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/26739797665.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609711be82296---40539321941.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/56cd7b988e9900303a7fc4534ba97c5c/tudutalofunudomezitife.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b67792171---nevefifenafugirit.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/26602488990.pdfIn PDF document text
    • http://vo23.ru/upload/file/19552747291.pdfIn PDF document text
    • http://195exim.com/datas/files/lakujixepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=timber+yards+near+me+open+todayPDF 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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 10724 bytes
SHA-256: 7b86731d2dd08e0a8c0534179dfc62cc09d00735f54f9a1f7381e6c31ae335dd
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 15660 bytes
SHA-256: 985f058a921ec68c119ad1140b0c5edccb19b93f4fab596d15745aa8de37fa20

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