Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16e896edad7d73e…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 09:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e120433f8ba62ce86855f41de405bca9 SHA-1: 15bc045dfefc7fb9494bacb49a8da521fb58fd40 SHA-256: f16e896edad7d73ea6c38c9ca84012d8778ca4a6e1cc6adb5a26043eb483462a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=readings+in+deviant+behavior+pdf PDF link annotation
    • https://nikosdimos.gr/userfiles/file/jozukorop.pdfIn PDF document text
    • http://blueyee.com/upload/file/311408008983.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210723065415.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/220725551.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/19900769511.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jozajojetunadotutidolas.pdfIn PDF document text
    • http://industra.sk/userfiles/file/ledukifugewem.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7bh31til3c89bs9mb3cibkbf70/99343269068.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/jazejomo.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/gelipakegenosubekadadis.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/sisuwubeseni.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/386bc51fe8f367c4a35cd42ee98d9c15/21299938134.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jekibebag.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a851ba18a4a---62456333920.pdfIn PDF document text
    • https://digireg.it/upload/40419700574.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/89321601352.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/biribi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/46852212538.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c72514aefdc---lipidamatamalal.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/ledonajodoxafikuva.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/26178961205.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/88918510694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3848bcf9---kusonifatomezopu.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_off0000c3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D9 10984 bytes
SHA-256: fd860d1acb097650e214ee5a93ccbbd4811a1dd49bd7557c9f552ca878fa1053
font_01_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 17280 bytes
SHA-256: 429cf346a0aa65e423c3438d070f9f1407bc609ace1de9e8554829ab3ab0df72
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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