Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa0641c1dc1c7a5…

MALICIOUS

PDF

94.6 KB Created: 2021-06-25 17:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 304f7a88416e729f67ffa4a85a72068b SHA-1: 99b0f5c4494d27ca536388e86f26de1ae7dc587a SHA-256: aaa0641c1dc1c7a57f33f0782ed3cefb03032f02f3f89f8594b445af447079b5
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1946

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/001db70d03f65aff9e944fcf40c1c54f/newazuvirazifagila.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0882a36f1---95794484885.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kovasusubizonepawikibipe.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/40763771312.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/035ae0605f97770a192a5220bf5620ad/23259567579.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xelubifamepegumikusan.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/er4ov3svf5puaiprmscobt3l3l/412454595.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8rlja4m1911jm1ul47vhpemqdr/88821143610.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d126677a4c---jumufesazon.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/66933f3135773f7bd05a2ff0927735d2/ximefaxafixiwodakefisujef.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/87130993904.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161182334.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c93fe0752ff5ae884ff819c2b5d3017f/vapoputapubebu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1pna7grjm6nj0l6adkdbso1drm/rupojoriripejidupazenowa.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/61622438108.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a343cbaa60d---kasiripudekiniwe.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/85c04ba7256ea39d934b1870f59c0f14/73573493386.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c98cc3a9207---51821697988.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/dt26u4l2rdbv5gnl15ibjm8785/78047649788.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7a1c52668c5a26eef6e8ef2fab648311/tadinevaxuv.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/72033722406.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf0e14aa6---90638651151.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce62725b52---44809360305.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975a1907a06---35073774905.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d1c41f3f793b3fbf97d10e1ff1b4fbe0/xulamixulas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9d40f0d9---bedanawuteku.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/xumofutepexowomigoxapega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=index+of+2018+hollywood+moviesPDF 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_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 11080 bytes
SHA-256: 4136a53a84a49b68b9cdfa6d8b5d30f0c46d11efc2613bf7f075383354cf3bdf
font_01_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 16864 bytes
SHA-256: a0d25e08dc6a4699640a34fc895afe2fbe8ce3f805f9e839845757b13fca404c
font_02_sfnt_off000163f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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