Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f05a3fe87bfd93…

MALICIOUS

PDF

93.6 KB Created: 2021-09-15 20:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79e2cf8e34f4c26a8c341e581565b1c3 SHA-1: ec3cc9bc2d68949b13648b579cc3ac635b869b20 SHA-256: 16f05a3fe87bfd938fe75de84eeaeeaf89e31e223794714a63ecfac2fcf116ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://allytemp.ru/uplcv?utm_term=adenoids+and+tonsils+difference PDF link annotation
    • https://kozlovka.mebel18.com/uploads/files/newavaxanoma.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/37120369540.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/76ef83586551627ca22e74821ed7be7e/jijorap.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rurubinokiwalirikikajinuz.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/17260055752.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315e2a33bc9---56640317154.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/28800326332.pdfIn PDF document text
    • http://atrsara.ir/resource/files/zogodozakepeke.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/98008705076.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/65367314048.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/govaxudi.pdfIn PDF document text
    • http://levotst.com/uploads/files/fojobofipumex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854dee708c---45696111564.pdfIn PDF document text
    • http://uteambio.com/upload/files/rizirovokevedimalolo.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/diromafazajiwel.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/wabagiresakivesi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/960118d10b38ea30dfd3da3221c1cdf4/magozudoxemojafowotedir.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/dizadufewebol.pdfIn PDF document text
    • http://beijingteye.com/upload/files/38967112735.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/wexexajifi.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/73449836404.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/53244261786.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jesegidido.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_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 10448 bytes
SHA-256: 377103de706a76082e5024a4a47bac321f99d2bd134effe042aa0b399d3d0410
font_01_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 18228 bytes
SHA-256: ee05d0b468cdd9565cc3bb2720edf973fceec845745538f7bcf500251ad45706
font_02_sfnt_off000150b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1