Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5bbaeb2c8b60db…

MALICIOUS

PDF

71.6 KB Created: 2021-06-05 16:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4bfbf82925139f5c8e098beab179761 SHA-1: 4c332430fa3a1c12c78cff9ea0458031592d3078 SHA-256: be5bbaeb2c8b60dbe5af16477b9ee9734505b1f9b46b48ee89e5d510d6eaaeae
154 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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://coretry.ru/uplcv?utm_term=being+17+english+subtitles+dailymotion
    • https://aedwea.com/upload/foto/wojipibuvezefez.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c2cb400cf99bd0439ce82bcc16b218f5/40312028210.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9ff4c318---moxofoxefodokoreta.pdf
    • http://aldara-latinoamerica.com/userfiles/file/60805029184.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d630ac5dd---pifiruzisolixizabo.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/42964daf0c94b92b1d74b3a5d13ddb86/norelabefepamatokili.pdf
    • https://uniontend.com/userfiles/files/vulunitakipavomigupufe.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a364c9ab034---54790027993.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078d792cbfa3---vunabo.pdf
    • https://slide-bearing.com/d/files/1257811064.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14248e247f---rovip.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/94g8r94qejivchgf62qqqcni75/56025631400.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/01f3c3edd2aa9c89cfc3b594fa2705c6/41687041802.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0489puptga6kl0pv3bt35hkssv/13680572438.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8542d96def---1542433520.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d1d4ac6b---1368094782.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b47b2949f3d---bumagojugen.pdf
    • http://siembra.me/uploads/files/bazanutifemodowukipoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df75.bin
5cf7e9c2746739c73fb9b141373b5f5b4cb231b6c1386713e5f5c56faeb2adb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 5564 bytes
font_01_sfnt_off0000f24e.bin
0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 6148 bytes

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