Malicious PDF — malware analysis report

Static analysis result for SHA-256 923cefb8237bb55f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 01:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4524c9ccf92466aec01601b866310648 SHA-1: 5de3973bffa7aaaaa3eb7c21bb3ffeaa74362788 SHA-256: 923cefb8237bb55fe94b630a1e6dfaa760ad1d748a13adb1a18d92c2e6e5392e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=frontline+commando+d+day+game+download PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7f86cccb---2176845093.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kigadixonipetuv.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210915_6914CED74130CDB0.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/45988004848.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/62158242173.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f26f48c6d---30080721571.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/daxadakozoneradinelekezo.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/5665737583.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109041424439053.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/10966776241.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/13274809497.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/bubagenade.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/36226261198.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/43853247452.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939d29c9e8---kuzato.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/53044873233.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/61076034849.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/41633202170.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9700819d0---lijuwopumifipusetugesa.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/jubovufevakatabu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7c016221438ae9829d0b978b8de746a5/16793687793.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/verolobizuvakeven.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145b6a01a594---30738804444.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b85781e642---59721357895.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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 18136 bytes
SHA-256: 0ed9750a201693c62e5d93f35813ee1ecfb0db2d4553ee0411ac21d84425dd8b
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 10720 bytes
SHA-256: 44d957f1a36806da4a0654446c94e02c2da7b9142a5ca7ceab47086d6ccea0af

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