Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05f3416fa285f4e…

MALICIOUS

PDF

88.4 KB Created: 2021-08-04 16:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 657125e38d9e6c585473e2c388edfb62 SHA-1: e890bf73edd01c8abaaffc5704fa7b1e52581863 SHA-256: b05f3416fa285f4e05ed16aafee228f88988341218268360f2e2ddc13c6e218d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to deliver a malicious payload or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3445ce10f4467d9a2505dd8d04f73371/28744863141.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/65d1a58f7bdd58e6a6b35966a2c947f2/75182226678.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/15382427657.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107231709027021.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15c38f9ca---60044667149.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe0db8f39---22936810931.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ld2o789t5mj9euqjlascm2id5/nomuwadakakodixodupiropof.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ids3rfj4o0o5mfnjsrpp8316fp/16436101198.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/707a1f00f33694fbe6ea4398cb38a067/56392414839.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b8e11e1651d47d0ddda804613b75f68b/kilatavulofagipe.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/nijasesirajiz.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jugevax.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083413a2913a---powixisepelugabufuvupuj.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/25139506148.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a95089a13---monugaxof.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d593072a74b0a18e218cdb1250737209/63396701346.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d64b244bc---rigonoka.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9e541bd62---72689167567.pdfIn PDF document text
    • https://majubesar.info/contents//files/togakokononuzabeponoxipak.pdfIn PDF document text
    • https://gangnampools.com/contents//files/faravorobar.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nenow.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8d56727b---42407474194.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef3bafb82---14761614249.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b621e436732---64038322213.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/45668168598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spotify+premium+code+generator+2020PDF 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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 17000 bytes
SHA-256: f255a6c2c1c5cb1a43339e060f322e1cd660d3f2d577ee843b82bfed420c520e
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 11280 bytes
SHA-256: 06b9c0c707a0f804eae833c442cf848bd1dbb2ce0f34227936e784fc492ee528

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