Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ffcecc644344ce…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 05:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2de8115eeac9e98cc739b06b787f8694 SHA-1: bc3b328010ac0759ab37ae5e6eacbc113badc633 SHA-256: 22ffcecc644344ce626c90ce43c9a0c9a796109259affad1c82dd608d82ca3c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://pixel-pro.ru/upload/file/88447766015.pdf In PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/72188383163.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/95178124143.pdfIn PDF document text
    • http://mopron.ru/upload/files/15655258804.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/66442044785.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/98868845108.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/79858794275.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/mufosatofolomax.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/44640213655.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e71b56b027---wigolapedawakesaganeg.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/nozevi.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/48819231672.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lalobosa.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_03011807171D3B9B.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/5513460258.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/repasofajaledegosa.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/namimasededemadowenases.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614664ab90389---gukalelere.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/dulexa.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/75892750412.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021991523586040.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/38427188559.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gchn08qm0n3vbqoj3f9up99qu/kujoxad.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/komadujiverate.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d83b7b042e68774c30d32e5271a0c5a6/639299255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=purana+messenger+downloadPDF 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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 10588 bytes
SHA-256: 7bbda09766c5b56e23404775eb7093fa4060acd49f370694a7fdc248ac5fc856
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 15776 bytes
SHA-256: d189d212f395628b6aab5b459210e16cec0218a07d66ef85cd38f51feffc27e8

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