Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b610a5f2b46681…

MALICIOUS

PDF

72.0 KB Created: 2021-06-26 01:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d18ee589c697d0c2ec317dd833ceffae SHA-1: 103613a74bec8ef793cd59cdff2b2231cd7deb4c SHA-256: 81b610a5f2b46681008169e3724bf118ee6a6f4d7c42a78905290a6c81fdd70d
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3605

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ad8c188d396414e0b27da21c19504d51/59563300141.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/2883923579.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239a5582c0---99472157283.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/4013248544.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/difulisa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac712a3f917---37618568831.pdfIn PDF document text
    • https://kawanmto.net/contents//files/wevezepaxebetesotovavuxum.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/kuh2kljefljbddfo5p0pkic2hf/jaxiriximojipojer.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lobasgglgpnpr3b3v993qgve6p/belipowugakerax.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ffa17fdb1---777141782.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/jipodinavaviluduluvum.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105231525276984.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xolukodeso.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d55c55c21---wobidutirevozelaladupu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/25789135895.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/nakoramezujada.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/rigiwomareromozurojanuzor.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/53566245570.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06856e056a---kunolesoz.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/56108650819.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/67497864042.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfcd5d84e338cff41f7029a9ab1d531d/ragolegi.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kunirosojoxewilituri.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/motoxukop.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1ddmk7mprf05tltf66bami63tu/zugaganivub.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a7b94ba2236c59cfd5b68d8393ec2416/59338751184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=social+realism+and+the+american+novelPDF link annotation

Related samples 8

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