Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a35adf07d3b8dda…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 00:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c625a4a51e4c2f77fc0a4d0691f1c739 SHA-1: a30c88ac0c2ffd94d41ed49b9eebd393b0039993 SHA-256: 6a35adf07d3b8dda3e7dc73724812f1cdece1e3ea2a3b56a4fdf680b15e5108d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories or disposable hosting, designed to redirect users to malicious sites. The primary purpose appears to be directing users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://coretry.ru/uplcv?utm_term=free+t3+and+free+t4
    • https://study4student.com/cache/fck_files/file/xivezimapubalupobixa.pdf
    • http://thanhtindesign.vn/uploads/image/files/fixazuzasob.pdf
    • https://advance-pack.com/editor_upload/file/71857323507.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cce3ac1b---63561417613.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9mebtsgm7h7a6dq262ghpqvc4a/kozaveduf.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dba381730---50259625053.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7f97b5f6---rozevatagifaziwadojizimed.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8fbdce8b8f680f24359bc4d16ba728a7/xanunodav.pdf
    • http://mobilesamara.com/img/files/file/dosasixozafetowu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8355a3c8d---95174856198.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24020b4e3d---siziduzimemigis.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d32e2efa---40070675509.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/41281289141.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0fbe8bd6bf2fc4d305c66aaef24d984a/kinojadekepivemi.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc8ddf83b---duwudaxige.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2a54d117---maxirisobobaruvojevadu.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0ca570985c72a68a5c80776a3c28293e/50340540198.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b2489591---bajanewubemaxotiro.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2e9a9d26a---kopuwagazugo.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2e1eaf62---nivobuj.pdf
    • http://safeabortionnepal.com/userfiles/file/veduk.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d9f3d0e74b16fec56b3a9479f2097fd/45822563701.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0s28hvtt8ce21nuju0igi0ft76/51691579817.pdf
    • https://indobaliart.com/sitefiles/file/59262896163.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/75481caea715d3f2311ea176eab7760f/linapapuxesebenugebojabo.pdf
    • https://medlineplus.gov/lab-tests/triiodothyronine-t3-tests/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcd.bin
c9989e9b45041599428bc5ac99a1170678660c678f38e69724c4523e1b69ff11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16832 bytes
font_01_sfnt_off00011be5.bin
abd405084b8a61cdcb9c5b16bb6cbd9654c97c53d56ddb21c1dfa8afb826e795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10148 bytes
font_02_sfnt_off000132c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 16792 bytes

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