Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b126b9f26632e4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 01:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4ff73d5355c1d91597eaeb384014d05 SHA-1: ccd7c4141cb8db94a0b6b4afedaed23f3753fec2 SHA-256: 83b126b9f26632e493d2d8c3fd32aa562fe5c6e4449d36f99bb5945e88572b75
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 disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=astronomy+today+free+pdf PDF link annotation
    • http://sattosushi.com/uploads/files/wafizumimiderirelerotujem.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/gefudetubizutigimewukim.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/jexakosegutudoje.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/viwurerurewelo.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/wemuvapeluvexodo.pdfIn PDF document text
    • http://ccsl.asia/files/xirajesowazikukofug.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/4110905533.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/77711529935.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/lumuzuxinit.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/timesub.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fapepilatesinipogipo.pdfIn PDF document text
    • http://premo.at/userfiles/file/27885790707.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeefe1dd4---51237155256.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415797e542---22495465267.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/jebebeteko.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c749741ae---kigovamaxovorugemeweka.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/posojivosokaba.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4f369150---3531238636.pdfIn PDF document text
    • http://netart.hu/userfiles/file/86120188002.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/mureriwoviza.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/muvovudazidujelenosujukog.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/25193369362.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/lifenuwewoxovewejemapozum.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_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 17480 bytes
SHA-256: 77225f08d44fe4664c97c185b399efeded7a73b2fdff2c5a246ab64954451fa3
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10616 bytes
SHA-256: 909fb47153508bfde4dcdc9fda5a8f7ee4542b33688168460d5be0bf0481e090
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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