Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8d58f59ce4a47…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 16:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2f08f561f156717094613aeb34b7aba SHA-1: f85436effb4b887324ef69b2fa85ee40318af30c SHA-256: e8f8d58f59ce4a470f6ae3c2de8079ae55f96bbccc017047d7aea6109e650704
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as a phishing trojan by ClamAV. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bankerz.in/qpic/files/rufoxizubax.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614274e0b7717---80607420842.pdf
    • http://homokkepek.hu/editor_up/dorilugevis.pdf
    • https://riwg.in/userfiles/file/wixuparetosuzuxasuxilam.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7db2b340e53522205931990b30c09725/sabejogodufukile.pdf
    • https://sharjahcements.com/images/bulk_images/files/katuwokipajozofa.pdf
    • http://brcassociati.com/userfiles/files/feluzupovapujatud.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e18aaab9baa17025bafa00b378f55a87/kupasukemixutefarodazi.pdf
    • http://lso-msm.fr/userfiles/file/79690051933.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/josafatovelitakexewepeji.pdf
    • http://dailitara.lt/bites/uploads/file/1302126557.pdf
    • http://vetcasatenovo.it/userfiles/files/80978738260.pdf
    • https://toskov-yordanov.com/userfiles/file/timigefawegogeteja.pdf
    • https://matao.ro/app/webroot/files/userfiles/files/74450272365.pdf
    • http://elosc.com/upFile/file///ITX202109141109471923.pdf
    • http://barudan.hk/UploadFile/file/20210910110906882.pdf
    • https://kcss.hu/korosi/userfiles/file/lajidawuwoninar.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/1035068636.pdf
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/46825313154.pdf
    • http://4wheelchile.cl/admin/uploads/file/vobadatafow.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410ab7a7c59---dofenifesiga.pdf
    • http://zoekidsworld.com/userfiles/file/dutosiziwerakejakasavevig.pdf
    • http://pushgroup.lv/userfiles/files/20039436215.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/tofolazadujuba.pdf
    • http://pcccmiennam.com/media/ftp/file/79128114180.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tamil+new+movies+free+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e224.bin
0920e557e5ecfcf4255fa662d977c46e549514b24540ccb28ed3fdd4ac5047e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 10532 bytes
font_01_sfnt_off0000fa21.bin
6a89c00d4f00a9dec21115a0fbc65bda781a3e521c5901b10fe012075d837ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 17692 bytes

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