Malicious PDF — malware analysis report

Static analysis result for SHA-256 997d59f0fe8be0b3…

MALICIOUS

PDF

87.3 KB Created: 2021-07-24 21:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 040e327a1500e6c67859f5b5937f50ae SHA-1: a8d26f3b255bd1c4411674e8b9465964b1e82d86 SHA-256: 997d59f0fe8be0b3aabe4ad816f119516cdd0d0a4bec590c75f85a8809949d5e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV, indicating it's a Pdf.Phishing.Trojan. Static analysis reveals a link farm structure within the PDF, pointing to multiple compromised CMS upload locations and disposable hosting sites. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3146

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://hifimarkt.org/kunden/kronhardt/ckfinder/userfiles/files/37913845512.pdf In PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/76297837473.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/jesanuvonol.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/sovesel.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/uedl59ptt3u40khgsip3ja47a4/25725638363.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd276a18a---jetawawi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4fd9e36409bf84798f585b531c226e69/64167904351.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/dilatewesudukuropimir.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/vusumemigapexadus.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/67553773540.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/82410773671.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/solexiworap.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32140471399.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/92981408506.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0555496212---zanel.pdfIn PDF document text
    • http://abpaluso.com/upload/file/69463482566.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/67106342340.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050808282364199.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a88f2c98a3bf7e1c6c4ee47da9985122/kozibifuluxokexovoke.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/20785909296.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e770c87f3---64059390846.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/965ced87326d317398985b26e71147d5/nitesujexogunowibusojob.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/21722461292.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/76319276916.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/mobitaguji.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/vomawotusasexezedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=woodworking+for+dummies+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 17528 bytes
SHA-256: 55bf04a0d32b3d6970ccfe521f4e787efc77f948cc0082f1d3ebe782798c2948
font_01_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC2 10804 bytes
SHA-256: 16f26e862a639e4dea745d46e98be8cf326af110a785b6ef95f8d70ca456d0f3