Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbede98809fc0d1…

MALICIOUS

PDF

86.1 KB Created: 2021-08-24 08:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16cdd136c1ca70e4ac4d9181b2f1f3b4 SHA-1: 2ef78a47b5c27f3ef4f91a3884fcb36112b4d60f SHA-256: acbede98809fc0d192832bfb2bdfa75466adc8ad42e05a2e8079a13172958b9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=forward+meaning+in+malayalam PDF link annotation
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95476178048.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nisina.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/3561330998.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a2a2eb89a392i26vs98euj0ias/julitotudotizopev.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/157578ac611f6af7aa349d53db398366/sagunavuferasepaxaronuxo.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/50319396052.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/2475799449.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/vexufejakokikevatodufivi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1a6dfb22---7068345015.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/35257680527.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d022981f35d59af1263c38c4a32b9515/newepodilosusujutofiw.pdfIn PDF document text
    • http://katachizu.com/img/news/files/kipesixun.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/pixepubamonidifubinu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/179d1fa414fde06f29d9b8564437eb77/10783116737.pdfIn PDF document text
    • https://susta.vn/userfiles/file/notad.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/24218264834.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/potatedol.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/55683637088.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1d8f2fda276ad7eeeeacf95c18b00b48/fudoveriruvowoko.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210701010623_1lhkjg.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932b745fd4---zizejeluvarubinebo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/naxoraruvebosonavugu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 16524 bytes
SHA-256: 3cdf4f8f4dce7a464fe4e8ceb6988aa5bf7bbea20165803f235b519784394ddd
font_01_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16996 bytes
SHA-256: f45946bf4600ae013c8dc6b5c239726be9a1e660c8a163bec2c7dfc009ec0449
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 10500 bytes
SHA-256: 88584b34177591df98ff421678dfc41b288bb375d51b54bdc4bd69a33efa2abf
font_03_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000140c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C9 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c

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