Malicious PDF — malware analysis report

Static analysis result for SHA-256 552fc779a237cda2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 02:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a7f13ea22075792b3359cf5b3b73626 SHA-1: 07becf75280e88c2ae0a733313a38effa288ba06 SHA-256: 552fc779a237cda22a239aaa95ffb09899bd0e7d24815c379498e3bca062b3b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131d88360fab---toruzamosonelerugowumuk.pdf In PDF document text
    • https://drddvichitra.com/userfiles/file/nudugila.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/77442789051.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f586fb2---popogekafiwerewezuna.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/gofepimufopar.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/53597094968.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/36195473165.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8c0ba731---waforonunomofafof.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/jozofibuzolojafov.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/89904987297.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_350B62A693551AF2.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/23087767416.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/vilewel.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zabapufivazegefisinilumu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ce77d8abfbb40a215b71642d943611bd/9022450551.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/jusiminuralubusa.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/lapozafovaremowuvifuxut.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/sagovum.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wefomabevivet.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/11324465947.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/wivemufipidup.pdfIn PDF document text
    • https://shibbirs.com/media/files/xudototuwizasaxo.pdfIn PDF document text
    • http://decorstore.eu/upload/file/61429987601.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/6376766006.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/82626675656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dawn+of+the+titans+mod+apkPDF 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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 10796 bytes
SHA-256: 25fed9af07521c9bc8edb37c0f8a31d3bc5b3887807685e710ad6bcf9bfb0786
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 20300 bytes
SHA-256: 84a61653ac21eb6fd24ae3082689020bf996d84224c9d29a051981d30359059a
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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