Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb234d31237188e7…

MALICIOUS

PDF

158.7 KB Created: 2021-09-08 06:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ba3b5ee1200911fb120789d2f5a38d5c SHA-1: 10521741411971f0055f1a4170749d3436158f78 SHA-256: eb234d31237188e77cbe0ef4b058160f9aba526f21a14fd7959fcaec49cc07de
176 Risk Score

Malware Insights

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

This PDF file is identified as a phishing trojan by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pattern, indicating the document's content is designed to trick users into interacting further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gibisch.org/files/files/dudulovijuzufekarab.pdf In PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/93956755254.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbed52f123---27296409045.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3b844848d53af4617596fe522d527e3f/29827375735.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/korow.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/l8rqcgoqq5o6qajolbp75adl80/rexadowabaruzemilobofiki.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094807076884---17508913443.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s9okacf8ud92m6dgslgl59l8qo/83134450547.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/96904609922.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fbd4a1babd49bf7a6dde7e117d54abc7/21929008840.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f600c3aa0e---jodotok.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/93823501966.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b862b4a202---15621974755.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/smstpock11fcfi8ei1vq8e4fff/71024557835.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/birojobaxemaruwi.pdfIn PDF document text
    • http://thedreams.cz/files/zosejikisokorolagiwuze.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2906c3ea1---rulokinifufeminagakek.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607488317cb20---69085641775.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/reririzarefatuvapeza.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942939ad4d---xuzodugujevekefitelarop.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d75bca5613---97748378710.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4761a9459---doradetufogajukuxasogodin.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/89f4866ac568449ba6e2b230cf664664/bogodapawilojepapined.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=canto+12+purgatorio+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_off00020b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B2B 18572 bytes
SHA-256: 8a574bc90a46a7c7a0e51aed2f967b4aa75e25287c95e617763e434f320037e8
font_01_sfnt_off00023c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002543e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2543E 10632 bytes
SHA-256: c6eb9d079436f6be0d90f15c770a5a1b1c5ac6eb699c4afca64e209dc7cff00a