Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acd7d1ecfc7f852…

MALICIOUS

PDF

63.7 KB Created: 2021-04-28 19:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db66be8e4e9eeef394ca50d2ae861d52 SHA-1: ce39236d7d18985b030f9a0656178e47ab81fa36 SHA-256: 6acd7d1ecfc7f852e36488f2e9e07e90326e832393185a0d49072989914a3ad5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://alnahamgroup.com/userfiles/file/48960251289.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081493c06aae---mebawebeto.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nskb50soopt0iard8g55fnrdib/98625007812.pdf
    • http://allycatering.com/userfiles/73096579138.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/22ae3ce35a25e1e2405d139d3445a8f9/49988291155.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4s8u9311fg5oei1v6kqi3jt08b/57666236262.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/u2mttb3kklpf1au9sj4dnhkbsq/vatuwelizujukifoletakaj.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6376ba1b4---tirariwasenupide.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb9d05ae---85948633527.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0bd634c6---39002986667.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20425ea11---filexijuvob.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4ecd888c---22142260585.pdf
    • https://allcreaturesinc.com/files/files/tunixaxitiw.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/51nfs2ik8hjtuur983mogombm6/telixusogejudelupisemivo.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36e6bdfef---56718985173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=blackberry+os+10.+3+2
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a8.bin
d81273e6d04063c6311a0a437bcfd0abbf15625025ba106d14c39175d73f86b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 5668 bytes

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