Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d0a912c299c04…

MALICIOUS

PDF

72.0 KB Created: 2021-08-08 15:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cf2a31d1f8b6d96802940b289ff82de SHA-1: 82885cfb93fe02fee417abc8344972c2631edce5 SHA-256: b89d0a912c299c04caece9a9a97c14f29ce5a10dc0281989ee6e78fc15393cdc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6613

Heuristics 5

  • 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
  • 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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t35aln6a74rdddm26pnc76j2nc/12253408344.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/45ab88c5d98369d13584f5d28b66cd31/kesagifupunerodiravini.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec96935d6c---vuxakejenujiroverofa.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/74643554650.pdf
    • https://12shio3.com/contents//files/siboxi.pdf
    • http://eko-inwest.eu/upload/file/javubiju.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ts9oslflflk6v9olu1pqi43e1/rurojajobadat.pdf
    • http://mulroyenvironmental.ie/userfiles/file/niziwozabup.pdf
    • http://pekingtogo.com/uploads/files/kuxagodupiwewoliroviba.pdf
    • https://goldenapp.net/file/tekomonebefijajuje.pdf
    • https://castel.ro/userfiles/file/goburefinavurojiw.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c9fc34788779bea6f4748c6ef2aa1df1/wirosisakosazofer.pdf
    • http://2ds-creations.fr/userfiles/file/fuzokopugesekim.pdf
    • https://dbmotorbrokers.com/userfiles/file/salasiz.pdf
    • http://cec-intl.ru/app/webroot/files/file/92676752958.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/guzofofef.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rn54lvah1ejn47dh0njbj20la8/77997255825.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/lupusifedirabedironip.pdf
    • http://africareview.in/userfiles/file/pudarafovarewamemi.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ft02314k5f4maar2bb4iratqvl/96145570209.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/xowawijuxid.pdf
    • http://zatacorp.com/upload/files/14543214409.pdf
    • http://vaonhaphatphap.com/images/uploads/files/96413102069.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb913b7d6---duzezobanuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+is+my+vape+pen+blinking+different+colors
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a8.bin
bf5214b3c1582c923239a7e9d2f164a40c6e87909a5f92ddf1e8afc939e1013d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 11472 bytes

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