Malicious PDF — malware analysis report

Static analysis result for SHA-256 e657f7bf017bc447…

MALICIOUS

PDF

91.8 KB Created: 2021-09-05 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0ca33404d43e921fbbb39844d7b289e SHA-1: acf33a75b559c6bd1ff1737618ab3386dab51be6 SHA-256: e657f7bf017bc447cecf5174afc09d6573fc9a7a3d9b5e48c21b2b4018b81d1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. The heuristics indicate that the PDF acts as a link farm, with many links pointing to potentially compromised websites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into visiting them. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=alprazolam+medley+bula+pdf PDF link annotation
    • http://originalcheck.it/public/img_admin/file///wimaso.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/tajaliza.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/202c33b5081aeff519304bf9ebf52200/lunezu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b12dc978e2---83002395288.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/335008510e88cecc659715aa79a16c8e/didokigezuwudu.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/nejesixodogagijakoji.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210825030706112484.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/4855459217.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/24004071370.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e88e5931---60785745777.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/30072830752.pdfIn PDF document text
    • http://mesterek.net/tmp/vofapejenebodiwobexaxi.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/23405560754.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b2f8d016c---45076376356.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/95813258271.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/42777466556.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/34788146808.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/5660476115.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a6388d14cf1b6bddcfb9d17f8702f2b2/kesekavujuloxoxuro.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/dubuvasekejilonegom.pdfIn PDF document text
    • http://holzbau-napetschnig.at/7717368204.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/94210258187.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609401166d394---jolemosejaposigebabob.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/zuxal.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105830d60396---bisowowuzopivurux.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_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10592 bytes
SHA-256: e7c8c7af7314601bff420b60bbe86738a65d6e433c2cb7bf2736f11cccfc8c8c
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 18660 bytes
SHA-256: 68ca40284801b23ce70145d3c8d04dd73a5c111c79f87944f0e617812a7be358

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