Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de39b4b29da69b9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 23:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8483d2aac276691029d3e77407f2fe29 SHA-1: 8d921d9f0a4e2506361dba4eb118fab8ff53e64a SHA-256: 5de39b4b29da69b90677158b912741880f9d009386f162e1fe65c69ae92af594
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. It contains multiple external URIs, some pointing to compromised WordPress uploads and others to disposable hosting, suggesting an attempt to distribute malicious content. The embedded JavaScript stream, while not fully analyzed, likely contributes to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kowokujonofedukupegiduw.pdf In PDF document text
    • http://kietminhrivet.com/upload/files/78412606332.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/volubawiloli.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/17609105959.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/34341035174.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/dimusuwiwuniku.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/gaxopanupomokexoli.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/856ce3e39984900b39f5e95916bec6cd/mifesofolamegenaxevepemob.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/tufezememunez.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/70085091343.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111901475620.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/85160056934.pdfIn PDF document text
    • https://geloracinta.com/contents/files/38760804736.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/51164527965.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2ebbb10ff30ec6bd94bb8d69a4ae3d2e/nerodijuvoziret.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/jimanipiwetejoku.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ab1f3ff6---luxazurorovazafotiribu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/nugajesaw.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/gelotivet.pdfIn PDF document text
    • https://proia.bg/userfiles/file/guwojozusotizagetafufuxe.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/70808627793.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gunanidekow.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/39930237873.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/73672401473.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/99567215361.pdfIn PDF document text
    • https://termoformat.md/img/files/kigibon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+apk+pc+free+windows+7PDF 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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 18476 bytes
SHA-256: 585d984ec07bfe8dcaf745b0b8b80d83b55db8b7b22bf0ea4000042142e882e8
font_01_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 10788 bytes
SHA-256: 98faba180e16b0bdd96c0e0a8686954651edc2546dbbae3304d3847f745c14b2

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