Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad9ae406708c19e…

MALICIOUS

PDF

96.0 KB Created: 2021-07-05 01:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a44a9b61dcea84080d5c8acc2b3d0677 SHA-1: b1470d5ecfb56f38d68c5beb7ec2ae1b08375392 SHA-256: 4ad9ae406708c19e7468308bcfe6024239466e44570bc3f7103d26d1263ee7a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document is designed to lure users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7af44d27---minapugunidevolitopexado.pdf In PDF document text
    • http://allmedicus.com/userfiles/file/23943920052.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8356ded98a74fbf72c0e85b3b11277ad/83724071559.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/aa2a4e721d0b14616731fbf5a2bf6d0b/39565999466.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/33df8de7bfdf4ff07400d2e6b6213810/vomapimedobitiwatuleza.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/31454840069.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2b29b06a---vudojumavogakedek.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072570ad2e21---3227643223.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fe51a4cea468df738c6edf6e3bf24a54/71688582700.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/wuwotozomoruvepududen.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6539fd018248ea04e01a873186df3682/fegedumukevimenujamilufe.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/vediladojodazemuko.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8db3a03c---semofazagidode.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/50674978466.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b194175b0685cd83a306039de729a64e/10219864468.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a83ded32415---72118814544.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/siwuxi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wubatowumunazuxawaduf.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607373491df03---mirimuzukomalofajevopizub.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d43deabb---xofafif.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/76938941140.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088733db9f30---remefekanufegutogafi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4us3nq1abldi5cairukgb093nd/vobudiguvabowigigaso.pdfIn PDF document text
    • http://effektfilm.de/files/file/68407270675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=to+be+sternPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 19300 bytes
SHA-256: 5a10b42d9336c6f3b1a046a9c267c12fbf8a44d2c212beb2439670bf4c5e85af
font_01_sfnt_off000144e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF9 9904 bytes
SHA-256: 799d366715deb0a2d1cc7de81764e01739ad675fe2eda69384d25f69d42b0e96

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