Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23f76fddfcc0c36…

MALICIOUS

PDF

94.4 KB Created: 2021-07-24 03:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eaad7f5d15a7c3bf3d96cbc0c5f81b2a SHA-1: ba6e99c32b8257409498bb48f971f3593fd2387e SHA-256: b23f76fddfcc0c366baa02b130f3ada9dacd64f0d38531b2b21b5b2e02c11126
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites and disposable domains. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely serves to obfuscate the malicious intent or to initiate a download, while the link farm aims to redirect the user to a malicious or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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://446888.top/userfiles/file/vidusakuwiketulikisuz.pdf In PDF document text
    • http://bendhorseride.com/userfiles/file/wenumepoka.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23cb4c8d2---dofupupatazolifagebugolo.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/tajuzub.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7e10f3ed737a7b054fc584acc29ea4e6/33061028341.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/73601436518.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878385dadaf---15735533002.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1897781e---9574048392.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/97130711686.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/besopojalevenok.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zibogekodosudubizowebuzo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6aba20d01992d5341cd7e6b4edc815ce/61198142542.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/tazabogize.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0b4b25ab---62506177030.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f046bc760d---modilo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/da1e62cd2615eff94ad876af871d228b/60757183539.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160714da92b8e2---botudori.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2fd0f6932b0aa1946b0cd1a34260c79a/bisalif.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/fc51493cfd61a4fc6104ee741591530b/gapalib.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nca7lqoc680edcagn8h4fsb2t5/wovepegubapigeguje.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xanutevotosogobowegux.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/rirubuxobolidurogepe.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/73890944582.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6a74ec1d9b2223d62c44c6a7ada01eed/zofamemepomona.pdfIn PDF document text
    • https://puppometalli.eu/file/26210225118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ulysses+poem+meaning+in+malayalamPDF 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_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10520 bytes
SHA-256: b7c7e88ffd87e8da1aa145aa482e0f4df11c9f883e77125b3a42f3202f240096
font_01_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5D 17108 bytes
SHA-256: 3eab1a53dcfaba968db30a69e4788964e5f79c64ec78b540a19fda905696e859

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