Malicious PDF — malware analysis report

Static analysis result for SHA-256 1004ceaac4845e4a…

MALICIOUS

PDF

107.8 KB Created: 2021-09-06 16:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d65e52ca8dd8262bbaad07c8e0f0f51 SHA-1: 5b95eea5c64cdb4a058ce1c61a475537745e7b3d SHA-256: 1004ceaac4845e4a4146c48409b12646b95324ae84177fa6a3f2a5c7be01d828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically leveraging the 'super-forms' plugin's upload directory. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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
  • 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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/f3d59j84925t3i2n7qo8v1lgu0/moxidava.pdf In PDF document text
    • https://novsport.com/content/File/8891468547.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c794169a8c---80769376650.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/es0043eovvnlgivfpbia8v45ql/julisajapatijoronosipe.pdfIn PDF document text
    • http://gptools.net/userfiles/file/42469536155.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/439ee51fcf6c535bea115aef26cbb58a/dofobedejileduguberawegi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/76bd67dc55a90a3c6481601557ec8af6/xedazufevodulorelave.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/585bfa547e344e8cefc978e7c9183190/kudokojefusakako.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/06b2445d35c482b83c6f5d62f24737c5/71441099205.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/fupopunu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/faoqfg16p2iu4m2iacm4utdip3/2741018610.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/adbad76385ddb22b8f8232f22d10e6d0/lebaxijowez.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0de2ce08---bakonoxaseniviroworo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97939d826---88265617933.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/49911740538.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/46217646081.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/nogobewosexurotelezaxo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/i56i75qq1e99j73pa370bq8svd/2227097274.pdfIn PDF document text
    • http://nfc.soo.jp/file/fubapevuv.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca446ed68---13606292331.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41642a09fe---webuwexekilumokisasojifan.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/42388337345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=socrates+the+republic+pdfPDF 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_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 10928 bytes
SHA-256: 60e62196a4d247386727697eba855e7ea09427f70c94241607eb55f7befbb5c8
font_01_sfnt_off000154d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D7 20012 bytes
SHA-256: 6c050bed6c15123a040fa637e46098714be6692a208089221f88e564ddf3e744
font_02_sfnt_off000188c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1