Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a83b63fbaf762b7…

MALICIOUS

PDF

127.9 KB Created: 2021-09-02 12:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d07f56db385c65b07b9b6541f9db87a SHA-1: dfff560366520b04a0704859a60a6e017309daee SHA-256: 0a83b63fbaf762b73691461c579f9e8ad01265354d83a96e71e8a7b323d409c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, many of which are hosted on disposable domains, suggesting a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=anlage+v+2018+formular+pdf PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d18456f17---44892856279.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c689a128636---73699336335.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/67376873457.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/92984108208.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/rakaxisigatilel.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d198dd7a681---jerelonisozurapopenosumuv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b70e85e8d17---doposul.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/55126582679.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f7d95bb8---sariforirelubaxa.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xesidutawojon.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073400a4fc24---lodivanopesanuku.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/temiwuduzegate.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zebof.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51952210334.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/34798603648.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071457664dee---sijenasutagureni.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/74136801831.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/92540176550.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/bejovemorawufowi.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/subesu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955172b251---lotabimanelebapome.pdfIn PDF document text
    • https://diphong.com/uploads/xinuvaradebe.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/80070739414.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jstumec7sv4kui0h3pjn9r68cp/feparelejuzatugob.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/pupesiwigokulifimo.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_off0001873c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873C 22356 bytes
SHA-256: 91597d77292e71097a7afe22a5f4b7073c091d1dc99100b288e91c285aa1e16d
font_01_sfnt_off0001bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF7A 11132 bytes
SHA-256: ea297aa1c76003fbbed4c8936744ae4aa3f732f56cfaeafdbd22f99879f907d5
font_02_sfnt_off0001d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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