Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8805781d6f42746…

MALICIOUS

PDF

65.2 KB Created: 2021-05-26 13:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ef569b62b4435b4086425f8860f77e5 SHA-1: b3b7b9549b1fa746f8a6c52cb654086cf77ea02a SHA-256: e8805781d6f4274662ba2db1a7a46e8cb9981ade65856965997d71ae6712f2fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially untrusted hosting. The primary purpose appears to be redirecting users to external, malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8592

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://aimic.com/userfiles/file/1860834610.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8795b2a8c---nupotafelugofup.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828de8c488---xexebutope.pdf
    • http://ideas4mypool.com/userfiles/file/70508101264.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b9cf3268---vokus.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb50c21aeec1c45f5e00652613472/64760141671.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92d36c7b6---tevinupofeletaragarisiwin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e4d5750---subas.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd47b3ca7---lakoloraxukipijegavasafu.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f068ffbe7721abd8b6074a65a8170b1e/31092930853.pdf
    • http://novussiteyonetimi.com/uploads/file/27330175077.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1db748f20549303aeba97e16db66a089/tivufolijavomarefa.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095f6184a4b7---labibininalix.pdf
    • http://koszyczarek.pl/userfiles/file/virudekesuv.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080120347af0---64179787005.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/atplmpsb61r1ss01ugcjc7noka/pojibivoletogazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=incursion+room+cheat+sheet
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d427.bin
3bf7be01d2b6c4775b6c658002e5e5456ee5c64dcd10c38704c3f530440d03b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 4944 bytes
font_01_sfnt_off0000e4ca.bin
22ceb87785b90b232c902bbbc65649fb1f08dc5119b5ab7954c02066738a564a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 10136 bytes

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