Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3646f87c2f66480…

MALICIOUS

PDF

75.9 KB Created: 2021-09-25 09:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f94fb2f276d258497cc843f96d8594c SHA-1: c76bbad100ac1d19f9be40491466dd19d67d469c SHA-256: c3646f87c2f66480f065b085ec0ae5a204bd8d416c442458e35d4eb0e2c8a866
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://chcial.ru/uplcv?utm_term=kof+mugen+all+gods+apk+free+download+for+android PDF link annotation
    • https://xuantruongtech.com/images/ckeditor/files/saxokubanalukirowemumo.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/neduxutugazunifunez.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xupuxupiges.pdfIn PDF document text
    • http://origo.ws/userfiles/file/xonupare.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/votugudalafu.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/kenavutatimavawewodop.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/3417567142.pdfIn PDF document text
    • http://labonscafe.com/userfiles/fowufotasotipowef.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/worogiwejenorovix.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/rosajoge.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/wobeperobowoziwawuka.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/76350084018.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/48970501146.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19421881753.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e84f99388d---giwemusavelu.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/33745052574.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/35677500462.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/pokum.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613529969362c---10733508890.pdfIn PDF document text
    • http://cssh.es/img/file/gixetod.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/84003554825.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e12e66d8f9---82241081594.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kffvn7hg3qerdj9hv7idhplcao/pariluwesapujobu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc871be651---42384581823.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/nedazekuvedofu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 18816 bytes
SHA-256: b389e08ad584e16157661b54949441430fc24ab30f9676d02115c59019c32427
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 1768 bytes
SHA-256: b8ae470a2820e1930820ba4c062af1a2c08d63a529c17feb8561d1ad37b9775d
font_03_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 11012 bytes
SHA-256: fa957c6eb87a3363995b96019f640b288e1af0d92592d1d4d6cb3879aa139b9b

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