Malicious PDF — malware analysis report

Static analysis result for SHA-256 192640cabff09e28…

MALICIOUS

PDF

99.6 KB Created: 2021-06-29 20:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3967b0694eebe30cdbad4ea2c35d363e SHA-1: 564a70688092ba6e3f64718cadcd7a2c07c5bb9e SHA-256: 192640cabff09e28acb6f9139caeb449b1911794394a4df44fa86575689f7a24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript, which is often used to obfuscate malicious links and redirect users. The heuristics indicate a link farm leveraging compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://parklanehotel.asia/userfiles/file/puvegafenewazanonevuziraf.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d14b72c32e981efe9500d69dc1f9b05/roloxokup.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9516dce77.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e363eb4f---dejakapexukorewum.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/57629660075.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/14884095616.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/98249321111.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/54617329596.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/3389018124.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/10331743379.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e52d3481---55206134417.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/18264477141.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14a5bf3fa---7590250705.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80a889fd06---nuvegowoxoxaxasisesom.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f44f90134a897d29cf3283b66b66b3f4/32622628891.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/k9q5tqcv6mc923qhfsupb1jcot/vetewatibedezifubamubari.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/636b1c9165a74d87e95cc45b6cf7577d/wudezomutodide.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/74186137842.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee75c8f95---muvonoxibuxivapavipevari.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366bf1b43a---xisemonilodapigizi.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/wisoluzelozadetitelu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/pinefozotarutojit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=living+things+nonlivingPDF 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_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C52 18020 bytes
SHA-256: cbb8e143b96d5021366ae0b028e55d31438f76b1e555f860d2a05f5c3183e1f0
font_02_sfnt_off00016b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4E 10016 bytes
SHA-256: 7ec8bb7b4462b25277c0ec9bc84f23c96672a07f23c6069a8cdb7810794347a0