Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa83e7330fae4230…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 15:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 574aac3847837da97f3fa14c045ea312 SHA-1: a50d73c4caebef0fd0e2de767b5c86253cf0f9c4 SHA-256: fa83e7330fae42307eb4349325a2e49ef1315329886264382db6980dc22c8abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute or host malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are commonly associated with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://king-tableware.com/uploads/files/202109032126301602.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613478debe647---25842719677.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_180450.pdfIn PDF document text
    • https://2winit.com/Files/files/70814789571.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vudoferekukor.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/lifomizedo.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/42028877613.pdfIn PDF document text
    • http://medica-brno.com/files/17592156617.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/rezogavupexex.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/miluw.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/debovosun.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dbc63dd5f647cee380f564084eaa5b88/81187583062.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/269789802.pdfIn PDF document text
    • http://kag.fr/userfiles/file/vavagewowirefuti.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84751890415.pdfIn PDF document text
    • http://learningkey.org/userfiles/mutigorasolupuwos.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21644245130.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631067303_4d977d22db.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e48lmr34r6ilekupnli2ngfmvj/fewusogulumozabuz.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/39673404842.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/drsa9uetl4t9m9bh8a9kvnghm6/zozigojarezuniru.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/92822392654.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/zarovepumekobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=guitar+theory+pdf+free+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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 18164 bytes
SHA-256: cb1af1c4d914ed51a0b1fa7bf49973feef78086fe71ab63393db0a1ad84ce7cf
font_02_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 10768 bytes
SHA-256: b2711526f5495b99c8e44ca4f748262f26a9150ad8ae02ca2f95b1ec178e4565