Malicious PDF — malware analysis report

Static analysis result for SHA-256 50af2ebe671c281a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 10:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c555f77bcb2e1299f845abfdfaf53b0 SHA-1: 5aa5951a452c5c7ba45cc6ab33df96aa2b587952 SHA-256: 50af2ebe671c281a5a6570607d85cb3baf059e35bec21e3582dab47e99241f20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://finalstage.biz/js/upload/files/7046565889.pdf In PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/vexapesazamifedowi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210821_C843214A86A54970.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/81275137083.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/26232917151.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/jomobuxarubu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c1ded147c2e91cf64fb6d7644f3b749d/53918806143.pdfIn PDF document text
    • http://christopherdallo.com/file/tegobozuxo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6000dc40dd87ba8733c334523a24cf3b/sogamukafijawokegazib.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/69224483412.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da3ec0933c1---19206631213.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160712686a5d4a---53975877256.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb33ef546---23160205612.pdfIn PDF document text
    • https://miet.hu/kepek/63418983551.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/xovesorilubolugitamugi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/47049777050.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c443deb91---49813230708.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2cbdcca75c923f9211649a305c335ad2/rapafopuvazevimimur.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160847df18c9c5---92567694446.pdfIn PDF document text
    • https://korankertas.com/contents/files/68767045512.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656d83922a---88104054954.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/wisefovedigozifa.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/27708006043.pdfIn PDF document text
    • http://cosyromania.com/media/file/69876389453.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/13419419003.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/fobezedujamekibitan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=important+properties+of+reinforcing+steel+pdfPDF 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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 17644 bytes
SHA-256: 5a6daf958aeef33e430673d9ed9ff1461f96b7e2ccfebf697b9305c0a244bf7b
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 10916 bytes
SHA-256: 044b152112d4a853509922117251f8dc68387e24b2c8add70b84c3a627b2a821

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