Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fd6f423139ccf2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-16 03:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39c01200f7a36dbb23d811e4228e2490 SHA-1: dbc50d7fa520de9e6fb6d33714c0f39081772ce7 SHA-256: 10fd6f423139ccf2b90ab39848fd842d3a0b189be889aacd38f8ef036499362b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or scam lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=pelisplus.com+ver+peliculas+online+accion PDF link annotation
    • http://dainichiji.com/upload_ckr/files/12309432890.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a86f1bd0d59f3f31510cfb4c0f40acdf/97442724432.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63e30e7f4c---39642288227.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210801173809.pdfIn PDF document text
    • http://easypayindia.in/userfiles/file/93800247021.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/wivipamatuzilorasejemase.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/50941232439.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/54356360683.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4d5kvccqpr876ahe5692phhup/zabevoro.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ffc67968---riwasuze.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/56674043256.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/68232650507.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23a3ded27---tobedonasifunopexebizije.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22229cf387---44252752942.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/gutikilikojaj.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/92633621984.pdfIn PDF document text
    • https://melz-feu.ru/upload/narole.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/26950546615.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/waxinusotufaf.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fa701f079---14052782014.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f885e101d5555f54f914d90c0e4b3b60/19464660924.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-1/20210601132009329619.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad8210e6f78fc65fe1b5c9f17dead91b/wafatumavakeraxixowigak.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/24228754345.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16972 bytes
SHA-256: 7b1b5b5a967b04a49a7e9a9354fd2f076ecc94ee6b991bcc93a5bd5243bb02cf
font_01_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 10668 bytes
SHA-256: 65d45816bf8df595a0a3d909892377ef50e86e5c234692645852e3b92a3cb8ef
font_03_sfnt_off00014637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14637 1820 bytes
SHA-256: 6cc4faa94e2d1a5d7c041c81a49b1fc62cf289ec9d48f48a63de8cfccb363b7b

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