Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1a80d751c75de1…

MALICIOUS

PDF

61.1 KB Created: 2021-06-21 15:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ee22e82abedf47a426327450ce40e54 SHA-1: dbe4112ebd1d3d16ad75c5bca860d601f908f606 SHA-256: ab1a80d751c75de176e7cb84dd22065ac510462384273d1f5271768ea62684de
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 ML classifiers and ClamAV, indicating it is a phishing or trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The presence of multiple links on disposable hosting and the use of compromised CMS uploads are strong indicators of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9448

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94926644c---senudutedugazafi.pdf
    • http://animationcoach.com/userfiles/file/jokedixurasavovir.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hsln3h4ln2oevhihssl804s48h/zenosixutugulike.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/05e6508a61602aa40cac9e3aa7b00bc0/96672136413.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lrg8lug4bc1i1rkvj5qos5j5n1/selewusabuleravup.pdf
    • http://georgefamilyreunion.org/clients/86186/File/76617917196.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b15e3ded3---28117128108.pdf
    • http://asupuro.com/user_data/image//file/laxeguvorebedukaresujapob.pdf
    • https://uleshuzataruhaz.hu/files/file/vamuzu.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41e8d70ba---nawep.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/94bd9d54ae625f958068b4aff56d7e84/xirofemir.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4925ceb1f---tavebetumenunimodojevomil.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/c02elf3c26epd8tt0cj69g41f0/46630293334.pdf
    • https://equinox-e.com/upload/files/68085619921.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/42799500634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sandhya+serial+in+tamil
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d0.bin
d7ba46dd573383864eb4083a36bce94d200b8d2d9ea237f670eaf3b8558e384f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 5272 bytes
font_01_sfnt_off0000db90.bin
f9643985dc667c70ac6d3dbc65ad56e2dabb699b428b6c664571ad1375ae49c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 2744 bytes

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