Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c23af38442ccd3…

MALICIOUS

PDF

89.7 KB Created: 2021-05-23 10:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d479928965bb9ab1b2bd80e11dc7ade5 SHA-1: 87f954190191e5ca06fb3fd4385e6408bf3c98e1 SHA-256: 28c23af38442ccd33010a31bce640d2cc3260a4fac269faebf7f64550edbedc4
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The embedded URLs suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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 https://huntic.ru/uplcv?utm_term=%25D8%25AA%25D9%2586%25D8%25A8%25D8%25A4%25D8%25A7%25D8%25AA+%25D9%2586%25D9%2588%25D8%25B3%25D8%25AA%25D8%25B1%25D8%25A7%25D8%25AF%25D8%25A7%25D9%2585%25D9%2588%25D8%25B3+%25D9%2584%25D8%25B3%25D9%2586%25D8%25A9+2020
    • http://www.bluewhaleline.com/image/upload/File/26071335916.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9681b59c---21896334024.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb7f0f73f---movodezutokapod.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/40tokj7er3jv1p2phv0ohdesb7/nuzifemowogixesal.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791b7c22bad---raxaxusunirenudojiga.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e2785395---5837003518.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/aedff5c1dd62155283547d5dbe4bcf3e/76162789272.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/448fccb9057eea77058950dae4cdc97f/10164333415.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18745027816098a07d6048a.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/bulojaxejoguduweneb.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921209bdba9---58080983896.pdf
    • http://www.aluvascientific.com/UserFiles/file/2622993416.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c970d31324---63391024198.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/04e5046dbfc2291a31d48fda0d5f6c7b/zibedaxokuwuk.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1c3def4b08dc5e0aea0a029ccf16b830/donabu.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6f8c475567a479bff27355bb79a960b4/6832297442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001321a.bin
9700de69c5c1f6a89e457a3b09e98eacd5b84c8c75e65eaaca5184738a8fc0e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1321A 31064 bytes
font_00_sfnt_off0000e790.bin
f826011a473f1ded16b7bef2d0679b23d82e9a963f457b3c73a0cd869db8a061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 4340 bytes
font_01_sfnt_off0000f667.bin
084a9f7725ae76a40d7eba8a1da53b6ef8b752dcc6f3f79871698a9ad19267de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 9616 bytes
font_02_sfnt_off000116fa.bin
9df53cfe6301dc22736e54d0bf3173ef8bee5c236fbb1db8da9ac9dc3b97c4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 18140 bytes

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