Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17b2fe59b817321…

MALICIOUS

PDF

99.1 KB Created: 2021-09-05 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8776a676c0fae35531b0096fb112508 SHA-1: e89922098fb8a176206ef6b11351d9961cf4394c SHA-256: f17b2fe59b817321c675948eec06b1902298b93160544f58fa0b7910efbac490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/88a12d0fb15232784c51053b9b59696f/xokisufopetugupa.pdf In PDF document text
    • http://wxeina.com/userfiles/files/jopanewizarufetupubono.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db60d78ade---16729154865.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/luzuvizatofepuvotinaxixu.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/dititaziwemadudawesexegor.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/bepakagivepewijomutagi.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/xeroberumudewojizaxiran.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b0243343c5a3e6dd7bc86e1a04d5f473/987531293.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2311fdeb5e---rivulutuximovugilekalo.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/suzanoxebilowikujegaluk.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/lejujominudetijemakopo.pdfIn PDF document text
    • http://happy-land.hu/editor_up/potajuxolozizovo.pdfIn PDF document text
    • http://www.heksan.com.pl/file/ridumidowovowekemedemor.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55ebccb86---pipujezo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d8801b93e6dff7560b32859c4301fd37/xanotimuxebikebaxiru.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/demomufabezifojugugebezog.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/inudl58t4b1mhilprp2loc26rq/bepijonaretinajolupafote.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/lowuf.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kewevim.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/pesoru.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d32ab14709c98f55f6e3fb53324a4bd3/mirobulozavutalaxupedap.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8737b65922d190cfae365c3faa16fdce/41782864231.pdfIn PDF document text
    • http://dgjst.com/upfile/file/54176531663.pdfIn PDF document text
    • https://aghs.in/ckfinder/userfiles/files/revijifone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=universalism+vs+cultural+relativism+human+rights+pdfPDF 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_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 19140 bytes
SHA-256: 3e2e4342cc84793909c52474600c81d849bb7975c7f697e7857a4f04c0161fd6
font_02_sfnt_off00016481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16481 11120 bytes
SHA-256: 4507f83fa17d9fc6ed50a195c45c2b182a48086bd7f7c03da0aaf245823ef4b1