Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ad5c0de54ea081…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 09:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8add505b908255aa6b401afbfc851708 SHA-1: 410726c7acaf5ef556b86ffa8c3e9d8f217b1be0 SHA-256: 55ad5c0de54ea081c06f983900d5bbef8e2dc8822082ec45070506111f175e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5fe4cded---kunalu.pdf In PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/vizivarosal.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/74884170597.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/abf2e331739b651934956b6a9c38a149/gopiwa.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/vuter.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/fupijijeruvowepoteb.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2ojqmsr6976ner5998r962od5/32230423763.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/gopiwumopow.pdfIn PDF document text
    • https://windsbs.biz/files/file/xabefonetonivutaxidufob.pdfIn PDF document text
    • http://veivel.com/userfiles/file/wavafalukufetomawubi.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/jonuzudasi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f77a8e56d12---nezafubusobokukupuwe.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/87171701536.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l0hneegbeof5hnismp0jdb16mt/60433043730.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e34235a222852612f2b695c83646368d/pofajarisal.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jijupilebewuwinorag.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/57231648243.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162301389356.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf25d3058f2---xezebixapojuxofo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081045e3930f---nufipegopar.pdfIn PDF document text
    • https://t2sc.me/userfiles/nozarume.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ad496466ec5b5f1aa6cc82e7b7cc739b/lapewiwexobojane.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/32357323296.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf10405f0d6---zakewinirofinenudesivel.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bvhpkoi04sfocdmmf81v4nee03/loxibifawomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=snow+removal+riverside+southPDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 17212 bytes
SHA-256: df108d550432012bafdf6ff2ce737b7b692d35b3b5bb1fac8952c2402f409231
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 10840 bytes
SHA-256: eef26a8a5122301d758e118e9fcf6151adf14b318fed73c277339b9deeb7174d

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