Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e2d5bd2982f069…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 12:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b88baf4d2fce73db58298858500a82b SHA-1: 5cb9fece4780dd973c7933ceb77e66614e876c90 SHA-256: 98e2d5bd2982f069cf62011e6d48231a025808e836eaabab6bf56d2b6bd30f8d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://weborder.cloud/userfiles/file///voluveriredutex.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/mf6ub51u36g6m94hniui01aojg/56698444115.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608545fda9959---71412486302.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7256725e40---31114339984.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/velezukid.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/67964222614.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r87hj1tutr450ulr75gakeul7q/68926543069.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/eeam2vi8ghrd2kb6l5u4b2ncn7/zakuremobedud.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/84811298226.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/zuniwufut.pdfIn PDF document text
    • http://reylab.com/userfiles/file/94884728958.pdfIn PDF document text
    • https://jetaime-shop.com/files/jajudalafejonilozixebobu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161182f25609ad---dowenilifumepesexejikoguj.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6a9184e0b016342acaf82efce6a251e6/pifubupitinelasijokafete.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/timixoseribosofejapu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qj1mrsf92i3u126akkbf0u5oa1/22289424883.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a94f9a999f69efcffbb76fadac847c9/65525117715.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bogiz.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/nowatidaxasit.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c3fd50d922abc51a2c94dca2a8785d1f/xezinawisawosoporidutop.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/farqml838734u0fapo0dhlvqk9/72600409869.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/36208835436.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/23658323856.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/rozonebolumesimunipoxigak.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aed8b031ae5b7d5c93142fe863e435b2/51761176844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=five+nights+at+freddy%27s+the+silver+eyes+pdf+plPDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 10848 bytes
SHA-256: 417da38c1cba3b0c396cf671a78fae3319ab04f6f811e0f4466ba168f5b22c16
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 17920 bytes
SHA-256: 33ee168ab6a6be6b43e45645988abd2d4811d36ef3b8d106d65797561c19979f
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1