Malicious PDF — malware analysis report

Static analysis result for SHA-256 981611447ddcc41b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 23:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce0e83d0cb08baf52252b8e672a1e958 SHA-1: adf127ce5361f6863fa53fbe6b30dbec9d495fe3 SHA-256: 981611447ddcc41b9e63c9bd174e19925ef3876ccdf87448f36c3a7897f7ae2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=towelroot+apk+download+2020 PDF link annotation
    • http://thermcom.cz/userfiles/file/feburuxadojaxami.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/27174811640.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135504e25049---batagejivup.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/matuvamojevefekewumazi.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40902307769.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/58062712042.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/dabewu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/43097915166.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442705dc40c---17483068314.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/fefixikulagokepud.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/726c13cf04f676002705f5175b3d865f/nuvizaxaw.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210913170554.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/mavadofijumexixu.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/99996354286.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cb9dd8b6---dijanunoxenopuzisuna.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/8837088468.pdfIn PDF document text
    • http://turnyras.lt/Files/file/pupovodat.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/vekon.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/biluvogufe.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/43159123227.pdfIn PDF document text
    • https://projetovm.com/uploads/files/83538547265.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/sunevulivuwidupipot.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/3134991267.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/kejudunizenefadina.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141ccf8d6a6e---46098861201.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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 10508 bytes
SHA-256: bbef09b9af114b1d254672aa8e78a43b4e28feec623978631e91ad604d368a2a
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 17780 bytes
SHA-256: 9a4d72466430cc3366d7a379a4e3b5b1cae4a3cbecbc2f3b50cc31cbae8f682b
font_02_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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