Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c99516ae16748e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 12:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dd7c67720e41b5e78f11f8bdb6482f2 SHA-1: 4fc2cc02c963890ea1f42f1fb42041858b4f47e2 SHA-256: b1c99516ae16748eb4e413f20e35a311021d87634645a3d28c0c9be1a8bdcdfe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to obscure malicious destinations. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=paganini+violin+concerto+1+pdf PDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c326ef4b2---zilazarogige.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb548be46---521524488.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/74654541050.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/kavesaxiwale.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac92ceea60---dodufabawinojisik.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oirleep9lkf1kct95upd5v3jb6/bomenojowel.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8fbac1ca6---89411978609.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/99951249133.pdfIn PDF document text
    • http://slsnn.ru/content/files/54559493344.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/52912016791.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/23419533064.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd48d8cc8---55673101708.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/259ea63173a8d4fb6c3e26329318a423/kedemopelaved.pdfIn PDF document text
    • http://ubest.ru/images/file/nininebaxatomaw.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/tefuxabofuxagona.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/tokopizufolenogepakexatu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373d7b7e6---lepizipidevivexizepuzoka.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7edf12c81---33994181979.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131139f8e4fb---guzobobokidojakuvu.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/megupewidem.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa8d0dbd4---79487789380.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/lapokorolag.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/jaguposeg.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108240507529320.pdfIn PDF document text
    • https://123natura.com/stockages/files/25676831601.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/43387811241.pdfIn PDF document text
    • 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_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10748 bytes
SHA-256: 9ebac5ed01e4a27eca596eea7413d5b4f952ae99ab87b1b83d684ce9091da3ad
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 19556 bytes
SHA-256: fb7968cf618f57b9b723220b69948ef9722af76b7fa0f3a05e11fc7a37218241

Open this report in the interactive analyzer, or submit your own file for analysis.