Malicious PDF — malware analysis report

Static analysis result for SHA-256 4011b7508be03252…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98769cdd685777e59d6a40cd56db8e1c SHA-1: 6c250c3aba12c0e5dfd8448dd023164bbb80a7a4 SHA-256: 4011b7508be03252be3604fd81ec8d46c627a453db9f85d19afdef95304e3536
154 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple URLs hosted on potentially disposable or compromised domains indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9321

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa934e08d0---82611621110.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114b56701d43---femigipabilabalefapikafiz.pdf
    • http://niezapominajkowo.eu/userfiles/file/60645015547.pdf
    • https://niboparis.com/upload/fckeditor/files/benoriguvonimiselogexelu.pdf
    • http://sunrui-ti.com/d/files/26260656635.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/931d70bea2157d4b8121c7f3fa0ab61e/fuvif.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b0f531076b153852a957460cdbd10050/dimor.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0da12774f9331e212450b147a1c686ff/sapurifoxise.pdf
    • http://adamlegal.com/userfiles/file/50638627505.pdf
    • http://espacioschillout.es/images/admin/file/69652776143.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/zisotanirerezanuvifotapif.pdf
    • http://mega.kz/media/upload/files/gumilasowami.pdf
    • http://congtyvima.com/images/Download/lavewusenoxeginu.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/kofagitufumalumokevimomo.pdf
    • https://mebelihome.ru/upload_picture/77920500476.pdf
    • http://korsorlampang.net/user_img/files/vorafolusuvikilixokiv.pdf
    • http://afgventuregroup.com/cfiles/file/4324897085.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e23de2ef5---58562287766.pdf
    • http://digilit.ir/basefile/digilitir/files/guwobumilepelijav.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b878bafffe---67749708981.pdf
    • https://psychologgia.pl/Upload/file/97493751367.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=reserved+ip+addresses+in+a+subnet
    • 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_off0000dbf2.bin
04c48f9823f7aeaa9366cb0cac040b7860e370e8d5b42259d57f1c9f6620dd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 21540 bytes

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