Malicious PDF — malware analysis report

Static analysis result for SHA-256 522eedcf3e026cc3…

MALICIOUS

PDF

66.7 KB Created: 2021-05-29 00:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 927efea87f4bacfb30e7513d17051e7a SHA-1: 078494b55d98ab786aad5446a746a8eee89549af SHA-256: 522eedcf3e026cc3eb8b5724d20fc9100ef7e7c1d63d4a659f540009c973f76d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, directing users to numerous compromised WordPress upload directories and disposable hosting sites. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

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 http://schokobrunnen.com/idata/47064195491.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f25cef0e64825e342d10442234c8562a/bamupewofasurenuvijunubul.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4f425403---vudetifi.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ec286dc---80947998967.pdf
    • https://actor-conseil.com/files/file/zedoxemar.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9547346524b36a5c5024b7a3415dc84c/2461859063.pdf
    • https://alnahamgroup.com/userfiles/file/47522819246.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a1b1ca7ff5422ac0277774a3a95acf78/pijazalono.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786e0db9976---93330111498.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/13aba27d50e79bd125128701b46b02c5/29808981160.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/53e9d1ab7c63af1592e4d3b194093836/36881756031.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cebb6f164e18d9fc5aa4b19adf43c6/10825283805.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7631755fa1bfd5dd1b609edf3e9ec8a0/47625787727.pdf
    • http://syuncyoku.jp/upload/file/makubajaxosetalafe.pdf
    • http://manavpublicschool.org/manav/userfiles/file/difono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+breathe+with+cpap+machine
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d681.bin
06fb84543bcc172dc1eb5bd1946d151898b8216ca4db9073d19c3e840abf89a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 5156 bytes
font_01_sfnt_off0000e7f0.bin
f0a80a93ecb4a5bbe1e7fe0b89a63e3678fc3124927b6e0fb734c7cfbedd96cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 11220 bytes

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