Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b4a8b44662d7f7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 00:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3209d865904ab8eeee8c97802185e73c SHA-1: e65e5cb2c98280483b7f35df6b33cd2719273b14 SHA-256: 95b4a8b44662d7f7a3f243f6dc44aa8e416c69cda198bdbacb1b0f379702d856
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, indicating a phishing or redirection campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The file's structure and numerous external links are consistent with a technique used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4747

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080a33d5f303---livajezobeg.pdf
    • https://101doctor.com/uploads/ckfiles/files/60d0125b0f491.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416d2f2414---jalurotukemur.pdf
    • https://groupburuemas1.com/contents/files/32332654843.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081319711c34---26087447100.pdf
    • http://vigen12.com/userfiles/file/97244307791.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6o8paf0ej8v1r1iar19pv6ebm3/19481568604.pdf
    • http://vds-construct.pl/userfiles/file/suboteloximisofoxarodixef.pdf
    • http://mtjjt.com/2013/upload/article/files/210724050238800988svxfm.pdf
    • http://benetalent.com/upload/files/fukafof.pdf
    • http://ogledalata.bg/uploads/pages/files/duxoge.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c1459681---36740882370.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d45697d02---37200291352.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/ridar.pdf
    • http://udmvdpo.ru/images/files/ragapo.pdf
    • http://kstarsmall.net/userfiles/file///woxofomotizanumimufowurek.pdf
    • http://ciskmv.com/css/file/dirosidanob.pdf
    • https://rainbowfurnitures.com/files/files/62781169393.pdf
    • http://miraesusan.com/ckupload/files/13557871605.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6mooajdsdqis5bioug91l47d3/57311364869.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9da131778---wedepasiva.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/wasubeniwagozapun.pdf
    • http://terrietanaka.com/library/files/razomarez.pdf
    • https://hoangnhataudio.vn/media/files/74935444661.pdf
    • http://edu-family72.ru/content/images/uploads/file/36979562678.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=interference+of+sound+waves+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1a.bin
c406ea0916d81a42b563606f63af1f96380113e3567fc83b6555290803d41434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 10676 bytes
font_01_sfnt_off0000f6cb.bin
975fc639a4f7e8393bf426b2414681a11fd299e0e9974e345a4f8987b9111130		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 18840 bytes
font_02_sfnt_off000128b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 16792 bytes

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