Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92d83ca5badeb84…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0eb5ddfa1b2f3bdfec408e213136c3dd SHA-1: 452f2af881dc156f3992d4f8757f61227a495726 SHA-256: b92d83ca5badeb8400d07aed2a6ea0c425b4482ff7a033b59dacfa2fcbda4b80
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. Heuristics indicate the JavaScript is likely used to redirect users to external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+delete+gmail+messages+from+android+phone PDF link annotation
    • http://noclegsosnowiec.pl/eurostyl/photos/file/1465275883.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/11664797111.pdfIn PDF document text
    • http://kustari.net/userfiles/file/luliwibajawupi.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bowegitupozilanod.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/fegagilokufifatadofi.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/rujutusumevibaj.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/16922599289.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/19972252851.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e3372a63d6f371d35e4e059f531227ad/fubixisevajisa.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/46409938771.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/xobun.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/43784586984.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/ladusarumuz.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/fofotevizopuzu.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/99541236276.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab860ee6f6---zikezivotaxanujukux.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/85662691836.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/23426134273.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138674591d1d---29354277894.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/13906790372.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/pexiguxulenajejoxixujoj.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/jipiwur.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/73541759194.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/diziret.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/wirefugif.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_off0000c03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 16548 bytes
SHA-256: 346e1e28f75f5f750cd00d33f2bfbc8eed7743560e4abbc5080307a0a68669a1
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11020 bytes
SHA-256: a1158bcf7f37e3fd79c63b1fbff6f4ff0c64f64cc4a505b1a79a3b599e6f6125

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