Malicious PDF — malware analysis report

Static analysis result for SHA-256 8183715e7555d7f4…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 11:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71222ab4b1bd391c67cc56b488007f3a SHA-1: 557bb6fdd66eca235c61a3579f3d6c743d3d6d8d SHA-256: 8183715e7555d7f4ca013d114a0516e272e869382279a5983fc7081a8c28ba46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The URLs suggest a lure related to downloading a game, but the actual content is heavily obfuscated. The presence of embedded JavaScript and the nature of the URLs indicate an attempt to download and execute a second-stage payload, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://krisoc.ru/uplcv?utm_term=world+cricket+championship+game+download PDF link annotation
    • http://carrasvilla.es/uploads/files/12050864232.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/lozexufe.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/kakedise.pdfIn PDF document text
    • https://schmitz.cz/res/file/10344806895.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/finabisigesidin.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16153a03bcf76d---96323291960.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/suwonumuwadorokasafe.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sanuxonidunanum.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lofubuzigoselalulibuku.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/80425253519.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/zubebunaluxufegak.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/89510323632.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/28125884885.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lduhff7mdmp5ko2o1eljbhctfc/39281719135.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/625865913.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/37414625298.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/xisuvigavowesawanidu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/46308144159.pdfIn PDF document text
    • http://cobmedia.hu/include/damujijaruxogenumew.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090619505761.pdfIn PDF document text
    • https://bem-sa.com/img/file/zanojiwa.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/14293474551.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/33695420378.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36b70f3a0---dewipozenufuvadati.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/divojus.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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 11132 bytes
SHA-256: 07fb5e88b7ecd5b09871920fc51ba5e691c38333c9e9635a4da69e12011ad7f6
font_01_sfnt_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16420 bytes
SHA-256: b317cf22aaaa53206572f0ccf12ef9452b5d5e76c3055467777e87a81f8861b8

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