Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d941661ff55fa68…

MALICIOUS

PDF

110.1 KB Created: 2021-08-23 13:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0176bc7a0d320ec140ed5875e8d5b119 SHA-1: 761843d15265d856afad4d20865ef36443d56b87 SHA-256: 2d941661ff55fa6814872c44af24fe3e36ab318144d49036f986bac9d94784a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1d9e4ed8c4eb957e21e3c259b36d9cd0/foderusoluzelelo.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9a53516e---bokoxubasav.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/tololezosumilubulenewilod.pdfIn PDF document text
    • https://activepymes.com/pub/file/kipej.pdfIn PDF document text
    • https://phillismaniglia.com/wp-content/plugins/super-forms/uploads/php/files/6700e4d6b00147d13a972daa20b4fbc0/83675014955.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9es08h86na733ijs51ul09pl7/82655445581.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad269e8d159---wupugebewotonazumegaku.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/23178167519.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f29a9175f---47212490366.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85471a7663---61518043778.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d12ae665---76921107945.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/266889721610b8922931a5.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50ca9d3e5---birazijozutepomigobamo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc008beabf---3816501917.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/dalog.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa4e66c50---88563093278.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/tanizelafibetenupofodije.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/16367718987.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa566a09489---zazomawafored.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc4c69aaa---tokawiliropox.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87160655510.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/99111167404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=individualism+us+history+definitionPDF 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_off00014a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 10848 bytes
SHA-256: e853ca65dbd80843e001cffcea7839f57b1cb3dfd71a24ed5fcf4142dcf21d6a
font_01_sfnt_off00016368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7A 17632 bytes
SHA-256: 3271b3ad3d0c452d415564fafeec02568f8b71dd573d4bdc25f12c0ef50e5084

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