Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5a297685663d75…

MALICIOUS

PDF

91.8 KB Created: 2021-07-05 13:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5e4b888efa50a12fe7b0153c9da40145 SHA-1: a701fb294bfc9de42599cf811732ead53859b51b SHA-256: 8f5a297685663d7569c32795ccc002f048da836cb2a60522d41027824c2f6162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it is intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/25429929120.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246824e978---59763663622.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zojiwuvolavajefakofo.pdfIn PDF document text
    • http://belst.by/upload/file/novobaputikilodolutet.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/55183478295.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1c308611c14027b913988241eb76d0c6/bezotokurowigoguze.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/61851018683.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dc17fc41---vexirolo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2p6g00jl99hc9nola0kcjemh75/50284338589.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3335b5d8b6---24451178982.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0eb3cec2---71357144152.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/aa7d5e3f49584d426c63572d1a914704/pazagumagekoxi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3f806afd---ruramezulejewafituripumu.pdfIn PDF document text
    • https://people11people.com/uploads/File/gepur.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/04e992bf1fecc3b97a8035a5463f7b40/ximilopojilirux.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e15a8810d---53644643393.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/79bf1a92c78922984618cca3d92c3017/63057610421.pdfIn PDF document text
    • http://citra.cl/userfiles/file/fodomapumuw.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1b3cd1c828a5da9e463844ac1c25b509/79189156409.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/g90iqsuq0v7pildfg14is3dg00/90234269528.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257bf358e9---refijuwupixifodenux.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b728599c5f8---kugomizom.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/xiruxivekuwijej.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/48ef42ec7c49d8ef0c7f995382f78868/5274886653.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c8470c5bf9731bfa255a34095b2d07cd/vexopexin.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/54879146741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kbps+to+gbpsPDF 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_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 18776 bytes
SHA-256: 0662aea2fc7e4844175deb4a15749f6a9b3422f8917827d894ef730fcad88640
font_01_sfnt_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 9920 bytes
SHA-256: 4f80f05046c7205ac8870133cc179089c63abcc6c4427e6161f1d8f338fdbf7c
font_02_sfnt_off00014a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1