Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f7c4cc600e497d…

MALICIOUS

PDF

107.3 KB Created: 2021-09-18 02:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d4568eb3e1147bc27ad6cfbd9a02230 SHA-1: 1c687ddc2ab0e5e5caab55baa9c6808ddf1a1670 SHA-256: c1f7c4cc600e497d4163bfa6f42ca90166862c82944fde2f8ceb8c70a928267f
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e1cc9f075f2b0875b3c6299be0f7cec/sunidesogilopoba.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/45459424399.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/pebodunobut.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/12845699590.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kolomutekopaxepabav.pdfIn PDF document text
    • https://korankertas.com/contents/files/43613827426.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/sitifawazibuxavuxafe.pdfIn PDF document text
    • http://mobiliteit.nu/files/lofulep.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/43806879711.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/90193062473.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/862f2fdac2db4d1d817568fbed08768c/84293919307.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b735b66442c51eb55b80375e419fdd6/penasoripogoketevafipevo.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/92617530258.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/nubezutedaziwewilopud.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/jomuforejozaxagulokam.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/2134243619.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/wizopokidef.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/nevex.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/86561126544.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/699421b19281b1b10540e4eb1f87fa3d/39359541525.pdfIn PDF document text
    • https://susta.vn/userfiles/file/78364254387.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161449c0180ee7---rawafijupixeritubixuzena.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-13/20210913182657951886.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/96150512015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=does+live+wallpaper+work+on+iphone+sePDF 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_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 17660 bytes
SHA-256: 561f515e0027487dfa196fa284df4cfad66d02a7e7ceab2a3995f8829036eb20
font_01_sfnt_off00016f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18744 10496 bytes
SHA-256: 9eabcf79a5f37b0c9a2a5fe365c36566ebe2309356bd96307fb6d50e4b310591

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