Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dc20e9f7668782…

MALICIOUS

PDF

88.7 KB Created: 2021-08-31 14:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02585e10f284d34bab0ffff47b818b91 SHA-1: 647bdc55fa33b2b239a9bc2375dbb9bd5263fdef SHA-256: 27dc20e9f7668782a9cb5e84cc306f89c757761ca3f6a683bc27e9a282825f28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of urgency lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=reliable+iptv+reviews PDF link annotation
    • https://chetanaus.org/bheru/uploadfiles/file/88037562473.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/2906282373.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/108459331.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/nokopazexemirititikulifu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085040ec6cc4---86245201633.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/rewejoni.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/vefanixukomovinurixi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/2kdmm6efkb39khj8aufls24sgi/xixilokotukomofebaru.pdfIn PDF document text
    • http://aven.su/userfiles/file/12820940003.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc094026a9---kekedu.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/lofanudofuzuxof.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/xopixikakojebunifedofejev.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c390c15b---vukererag.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/326474468.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f368292f22---kogarorezetixes.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/74999593747.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/14427616882.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc47732aeab---77671371115.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/kebekexolilibez.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/66247027086.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/muxerefemineguwex.pdfIn PDF document text
    • http://fygl.net/uploads/file/241011353278.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f3f429012---vomojawisuxewex.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_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 18140 bytes
SHA-256: c8afc8f2e46fde71e73c223677c62a503bdb15df0117b6448dfdc6c5d2813957
font_02_sfnt_off00013bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 10360 bytes
SHA-256: 4efb3581dcb66e676cad79066d2956a60d7332d0ea239d2ff961283fbf1273a7