Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf632f12f37db7ab…

MALICIOUS

PDF

54.0 KB Created: 2021-09-29 11:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12049909b0a9e32e2431c9f4b7ea73f0 SHA-1: 4339f89d9ddeac8025b3f753a8502d322dd12936 SHA-256: bf632f12f37db7ab2fca3aae98a9f5812b44c1c18942988c8922afe2bce9872b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to potentially compromised or disposable domains, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection ('ML_NYX_PDF_MALICIOUS', 'CLAMAV_DETECTION') strongly suggest malicious intent. The primary function appears to be redirecting users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6477

Heuristics 5

  • 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
  • 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://grabnerestriche.at/tadadogu.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/pisewebuvu.pdf
    • http://brenna-ski.pl/userfiles/file/23906962735.pdf
    • http://licausi.it/userfiles/files/52060331186.pdf
    • http://cavusofis.com/images_upload/files/45781224551.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f37b2b60b---xibekimoxonizol.pdf
    • http://pecsimutargygaleria.hu/files/file/35568224602.pdf
    • http://tbm-mova.by/images_from_html_editor/file/sikofuzufusepevo.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/11413590530.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614548aa63192---kiruriwukofijaw.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivukovinikesera.pdf
    • http://telecycling.org/files/file/83584007197.pdf
    • https://mgs-on-track.com/uploads/misc/files/gijizanelutowadafizilok.pdf
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/21723962224.pdf
    • http://balletpanov.com/uploads/files/kanewelekawuzijilusor.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/sanijanidebemisaki.pdf
    • https://sieseam.org/userfiles/files/lobas.pdf
    • http://electriccityusa.com/images/fck_uploads/file/60943907737.pdf
    • https://prestinireedcorp.com/userfiles/files/fadativosapegora.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o2a6l45ejpbr0j6k7284e2slv4/vagufegegoboxelizufo.pdf
    • https://kohphanganhotelandtour.com/userfiles/file/sizawuz.pdf
    • https://marcuspietrek.de/MARCUS/files/file/30018662660.pdf
    • http://beijingxinzhi.com/userfiles/file/20210918045023_2036680528.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/vafovivorunelolotolud.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7dd4ad2540cf6fa6c432f9cd4dd74f55/divefamuwilemosot.pdf
    • http://banhangcongnghe.com/upload/FCK/file/43431314293.pdf
    • http://gamecoast.by/uploads/files/jotuwezegagotuwugofolof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fake+robert+kiyosaki+book+pdf+free+download
    • 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_off0000b44b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 16792 bytes

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