Malicious PDF — malware analysis report

Static analysis result for SHA-256 276dd18a0e8c28a7…

MALICIOUS

PDF

63.7 KB Created: 2021-09-02 18:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 183afb2dce0fd98c9b728ffb09fc76ea SHA-1: 101a4c9e4868e746d7a69e495d1552df9d6af8ef SHA-256: 276dd18a0e8c28a780f82b8a93817e8b809a5736576eecc7f9a8d68143ff06b9
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b339e3fb2c---gezapobepu.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e24a282d1---fegigelonezak.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/78764645115.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/bemikesalubolax.pdf
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/gipisovenovasipamawun.pdf
    • http://auto-spec.ca/fck/file/bojopojutukuxofejenoz.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c480884f10---73105265081.pdf
    • http://ttmplus.com/userfiles/files/97346951326.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a93e93b8---20661253756.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a30a7f759---62177416835.pdf
    • http://steakclubhn.com/campannas/file/73771882879.pdf
    • https://vientangluc.com/upload/files/jitizibotalekeligilef.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b095a325---65938499478.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427e6db432---goxak.pdf
    • https://moveo-sport.pl/userfiles/file/56086008823.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/bewupubifulajejo.pdf
    • http://betonkeritesek.eu/Content/files/63749767692.pdf
    • http://muzeumostrowiec.pl/obrazy/file/47719688794.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2fn65v1o89ibjvmsh6p8l0caf9/57956818114.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607019cc3b525---81646527102.pdf
    • http://learningkey.org/userfiles/jimitimebisotetivonofemov.pdf
    • http://emeat.ru/var/files/31413512424.pdf
    • https://qpshouse.com/upload/image/file/59795725480.pdf
    • https://addsfly.com/userfiles/file/21694321404.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tree+diagram+worksheet+ks4
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c7.bin
806f39930d3079920a780384a316d0ffc61c46353d522d8b75090ef740c23c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 18388 bytes

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