Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16991e9ae420b77…

MALICIOUS

PDF

79.0 KB Created: 2021-08-16 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: db57dfb97cd162cd748b34e71e286ee6 SHA-1: d6eef98b793133f68e183ab141340d95478a13b8 SHA-256: f16991e9ae420b77143da9b6d62abcefeac89ffa892c59fa3f8f444a9a6652d1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=new+hindi+love+story+ringtone+mp3+download PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e000bcca7324815292d86509b5efebd5/dijejejotonejevuga.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/pinupegipanusabanijebe.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/99408361445.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/63841988742.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/41805017579.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/864118e51c00149e948ae8dff0992e18/63071743119.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/dumuzagixurexomitotakizen.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39684994882.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/93311568149.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kipim.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/17790446649.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7a0a1f72---jodugidibil.pdfIn PDF document text
    • https://cubic.is/userfiles/file/33321660367.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/98776218242.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/duwojopefigatatogavete.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/67576553636.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c17f937058a---fizififoxorozaxojixut.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/61151772459.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/78783520824.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/44806367975.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160997089eff60---51668386555.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d798fc7a---5425022679.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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 11252 bytes
SHA-256: 940e224a179297916abb40eaa8d854a27165b378704a5b541e70f67591eb977b
font_01_sfnt_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 17140 bytes
SHA-256: 54fb163085d8af0b412ff2dd685d4d54182237e4a998f74631c8580b194579f2

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