Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d856754426e86a…

MALICIOUS

PDF

90.1 KB Created: 2021-09-19 21:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 037bec38891acc04970bab5c9ba8afbe SHA-1: 3d9885017b46d8b30441a5461db7fe992062e645 SHA-256: 90d856754426e86af98fed90074b39e680401a75b05754553ee9035b03991fc5
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV heuristic specifically flags this as a phishing trojan, suggesting the intent is to lure users to malicious sites. The presence of multiple links on potentially compromised CMS uploads further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2664

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://huanghels.com/filespath/files/20210915230042.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/mejekutofeki.pdf
    • http://osstemcardiotec.com/files/fckeditor/file/1530180218613a85276c76b.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f55579bee---98788911554.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/gagapizetotofe.pdf
    • https://pypconsultores.mx/userfiles/file/limedefadijibudulaluwe.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/26716625976.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161466140993b0---logexadojumisonewiduzen.pdf
    • http://patanamachine.com/imgUpload/files/62162947127.pdf
    • http://reelproductionshd.com/userfiles/file/79441843714.pdf
    • https://pointwebhost.com/calisma2/files/uploads/zefuja.pdf
    • http://allmedicus.com/userfiles/file/56751381711.pdf
    • http://another-partner.morefriendship.com/upload/files/kimopiwulalilosumisedezo.pdf
    • http://ig-einheitsloks.de/medien/file/fakunimewuwagikeramima.pdf
    • http://tauroconsulting.pl/userfiles/file/kinopebim.pdf
    • http://snbedu.com/uploadfile/file///2021091523340327.pdf
    • https://dnm.tw/uploads/files/202109180926382576.pdf
    • http://letnipohar.cz/upload/file/17670758123.pdf
    • http://computergramm.com/userfiles/file/tijukumopanibesowevubuwok.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/69688101157.pdf
    • http://ck-kutnahora.cz/gais/image/file/70836351712.pdf
    • http://www.anclupnapoli.it/userfiles/file/54463993366.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1833001d---vajujoranubanuxas.pdf
    • http://robalton.es/Albums/images/file///faxuwataxumewobevuporojuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+video+and+music+downloader+app
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 16792 bytes
font_01_sfnt_off000131d8.bin
31368843d234d18e832a16dae6262f44f85a534ddafbf056599e82fef2a1d0ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 17856 bytes

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