Malicious PDF — malware analysis report

Static analysis result for SHA-256 796872fd52a58114…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 00:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e2eab4ea2ab81356ddbe2e43bd46feb8 SHA-1: 5e421f3cafcd7d626163215c354868ed3a76269d SHA-256: 796872fd52a58114e23331f64ed9a6ef5152c3bebb778812fa1c5710601ab498
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://brenderup.ro/mm/file/96920444021.pdf In PDF document text
    • https://hanomanberjaya.com/contents/files/pineseteven.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/sezobotoko.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/likobo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4c0bbd261---37176767568.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4d32299d---turadasimigafim.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210906030445_7uinme.pdfIn PDF document text
    • https://csn-alliance.com/data/files/laxilekakix.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/32224637017.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/11049038410.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/lexapaxumugemoja.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/sowupanumusupafuxipu.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/jubenotivegidefisu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6969428bf763e072a3a468027c11eb40/76160313849.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/25129543371.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/12719656015.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/kikekitozokesarurademaper.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/43729419891.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tunik.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lewutezijiva.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a23eddca8---numit.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/62545379986.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lotekezunuvilikotowili.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1283376a---gajevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=boruto+naruto+next+generations+dub+episodesPDF link annotation
    • 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_off0000cc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 17548 bytes
SHA-256: c949f19173eeac821e7072941978077e3236c1226d886aac29f249cb128ba7b1
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 10916 bytes
SHA-256: 7024006f2b46cc7d7845c3ceb9314202fd4c892c5e7c6a1f805c1d2a4f80f740

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