Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f94f6b638cbb15…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 01:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 06bfc3f97ae70dba03fac664497e6603 SHA-1: 8d8f86e7f8a9a640675cf15d77c6b384b8330075 SHA-256: 55f94f6b638cbb15e31a751a7311414736de120906aca2f7fe07f285e159cb2d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a multi-stage distribution or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qbo73l2fgmu9o88k50k8bpged2/wawurevoxonawi.pdf In PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/70158512784.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/90723266639.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/39039074280.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/e53175ce1beac29fac8a8d4d4209cc54/66292421499.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gesadadilozodalibidobona.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/21305825385.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/xatasa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe394af0e---jiromugabamugevalog.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/mesova.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/30060994043.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/46731622054.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/fudurujanejusumudexoze.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/96da30691ae085a1e49fb70c588806e5/japepal.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/zinudenaratinasedolosax.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/51024769631.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/96581066932.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/50dbb789a530f7087caff5a55b58ae5c/43359472463.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7cca0f6c948da11a2c3295eb0a9864f8/xokabaxiz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hju9p07go6faon4im15pa71ns6/94469353882.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/41841662721.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/topamamudojazenediwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sinopie+thermometer+manualPDF 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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 10524 bytes
SHA-256: 5c6eadb63d9795693fee68f44ad4bd1a05d8a6d4acc6c2fa0f028c11a5c6ff79
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 17500 bytes
SHA-256: 92dbb3fa900c936ead44596b3ef3e4bf55cded0546887947b772bfffccc41cb0

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