Malicious PDF — malware analysis report

Static analysis result for SHA-256 5506cd56c59628f5…

MALICIOUS

PDF

43.0 KB Created: 2021-06-16 05:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aad3f1aa211c8853d8c62104d21f8988 SHA-1: 35efefed7f1f31a1bb6d501a7da86d0020a42223 SHA-256: 5506cd56c59628f5f853234e2eddd5ef8329bdbcf837c7ff59d815b85216fc62
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The 'PDF_IMAGE_LURE' heuristic indicates it may present as an image to trick users into clicking. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for a phishing campaign or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7512

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=philippine+literature+a+history+and+anthology+by+bienvenido+lumbera+free+pdf PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b50fb35380d9bf667d1f315f41d77a89/gusibil.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/idgvir2jleiglbgvurq6g6597j/kavexavik.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c0b2de9e---banane.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c4dbe025---13303283617.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xodubejavijemegisevexi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f408cb65df---19079660442.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1ecea994---zosovexozeda.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/fe6b653262c0ffb9f7fd65fd328dfc85/daxomivovajaget.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bobebenesajepotirugun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f2d15fd5---44468312645.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4c57301---lenetiwawavoligugubaz.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49b539d78b6e82695fd4673c012a3aab/wijekogek.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jebunubumigifaxar.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/takevumemesa.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/62187546752.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9jl7mpjafk262967chs3qg3cj1/mibepumanosapevajewezo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a6a7b00c---nebuled.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/p5j74723vn686duri4gt9ufi5q/mupunano.pdfIn PDF document text
    • https://medtek.vn/storage/file/40803915717.pdfIn PDF document text

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