Malicious PDF — malware analysis report

Static analysis result for SHA-256 684759bb8d672651…

MALICIOUS

PDF

68.0 KB Created: 2021-05-06 03:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d429ea53670aa3fcb62b48e7b623a087 SHA-1: 93cec40e3796e8bff45620d327bffabdacd49c88 SHA-256: 684759bb8d672651cb232631dfb95c8492b935ece4a999be510197770971b6db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8569

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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/c4fteak4lvc2slfgeb8uhtgp3m/fenuguribuxeraku.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160712309b0b01---37269708386.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e86b91aa53ce9f80f9c8d663154241a6/12409350079.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894dadc1ea3---14068732564.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mf1ndvfrvmh5c7n3avktb51m73/21651575475.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8c4bd9o53qun9cllnuptip7m85/fukozekudusavaxake.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820367652a8---94388961252.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160881fb039ab1---18971210097.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9e3f3701376c1d9cc197ac8d9ad4c4e5/zoradapiresene.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/98ee2147a855c4cbd5d6e3b0255f3a17/tafasepawuvadegitur.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/rr77r1q543mn32mp8cr4a176jr/20557728184.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d79b4b849---15103526683.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a791ed5ca---58634022435.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c5f3cda---16184172309.pdf
    • http://ackerviewguesthouse.com/userfiles/file/sowima.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718db817b9c---53663739545.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/d21u7q583a66agjveumrk0hug3/bepinezitavof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=things+associated+with+canada+fight+list+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin
6bc847ab54faae852fd78555a24e053bc13ac5b5e08239a1671c54f2c24aca2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5324 bytes
font_01_sfnt_off0000edbf.bin
c69fcbe6fd502a6281f1e195be6672afe9a06eb2f40fe5f88369d105b5bbdcb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 10784 bytes

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