Malicious PDF — malware analysis report

Static analysis result for SHA-256 986876c91005aa30…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 08:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 974a7a3fdb07903c3daaa8f100fd61f8 SHA-1: 818ec2c12896aa75f6d77a74e35ebe3fbadda790 SHA-256: 986876c91005aa30f8775d354dbc4739ea7242732bcd682e6bb9818ebb05c74a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=ship+tycoon+mod+apk PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/070c8f80a173829bb42fcc4676727143/risijivopodi.pdfIn PDF document text
    • http://ch-yang.com/upload/files/28799336425.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/67927476261.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/zuxuputalebu.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/39513509087.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417ad5d8403---wavixufusis.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/tenifaxipitololil.pdfIn PDF document text
    • https://sainaudit.mn/File/22774353504.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/kosivuzonixodanoxiba.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/magofukinakezunexox.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/58025463394.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161471cea947b1---nuvobakuluwukedufakiwak.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/38057701088.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/bolujokobanejapulavodozut.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/12101220076.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/96aab23133b0c3c4538f3d8a5099495e/popomomotalos.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139db368e9fa---mafegilujaxep.pdfIn PDF document text
    • http://3sdent.com/upload/files/joxelukaru.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/roxemuxarukosonekamisix.pdfIn PDF document text
    • https://longhoang.vn/upload/files/gizaligugitopagutum.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/22444062915.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139be2e773a3---72061204692.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajotuzunasakefebuno.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408da964798---76753328380.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/goguvaxuworu.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_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 18452 bytes
SHA-256: f7cb162456be901a40f9cef92832342ff84d0007570b3023e70b827f8a9c30e5
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 10612 bytes
SHA-256: 12b45f82aa7f7dce987156a6d54ab4e160896a73a0a3595016c31fc06356e5f8
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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