Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a3a36985d34696…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 23:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d69433371bd034735da3aa5360447f1 SHA-1: 645f0513dc5cd057c4d20ec8d7e555d071fa044b SHA-256: 15a3a36985d34696a5f8e20c0f700ad80d481b71494b520e2390c334baa7fa72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic firings indicate this PDF is part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=best+video+call+quality PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906012745566742.pdfIn PDF document text
    • http://abworder.com/uploads/files/ligegezesupadozadesedi.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/93874118460.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ie86pemvt1its9975h2eokgkdh/95070235643.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lewivan.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/12003730353.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/214f287138c37b3e4c9a944f43330817/sipisasutavibex.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/87703871528.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc77c4030---lutezezun.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/68281756564.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/lipovidu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cea64a2b---fogewi.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/18605993141.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/12506022480.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/21036633344.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/63932128382.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461b8d0ca27---34977606178.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337cdc7eb53---49744717071.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/67057393685.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7a91442---87821933965.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133142409d70---79235038403.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/19245753902.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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 17980 bytes
SHA-256: 08d60e49cdb68955874bf891512a49f02b67129dd1e2e7e93fa0b422b8116bf3
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10640 bytes
SHA-256: 0a3fd2718899eaf3e5b4a152f678163452515c08aec5504a3630568ef157b514
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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