Malicious PDF — malware analysis report

Static analysis result for SHA-256 4206dca032836b4a…

MALICIOUS

PDF

91.4 KB Created: 2021-07-22 23:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c76bb976cc87158dc6c63a8407d093b6 SHA-1: 850177822a159925249ba727e1fc2b25c0050a11 SHA-256: 4206dca032836b4af72f7493536231729fe5f8bb357435ec3ff092797188d97b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/57934912933.pdf In PDF document text
    • http://jhdljz.com/userfiles/file/1624201900.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/i55hrti6b3ghiqbiedsteloro9/49767413976.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/73330909623.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6c56ae9fa9a0eeb10eafff59124d92e6/rigizulunanulolodolupu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f226c1ac---zuketexuvopajurozutavi.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/62e6e53c7f8f67ee0590e516866cac52/bapimur.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ce7b0d44---98942662840.pdfIn PDF document text
    • http://artospace.com/pics/file/59577875678.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xetaxafawegulopujo.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/dozudavafasibebuporurisu.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/wipizalipaxojamegivo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3cc6ecdba925d4a2881e3bc5e3c68f8a/tusiken.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459a9079c7---72581028878.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/39297925560.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kaxubugovimasotimewak.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/70279933488.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961505711f3---xavafezarotaruwagaz.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/77713686625.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49df9ccbba---sebijejulazasu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a161f592a05---fibovitimuv.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210613210548.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bevuxofibow.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l1a3jgglvfcbp5dfrlms77v7b6/77258284562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=managerial+round+questions+and+answersPDF 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_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16800 bytes
SHA-256: a14c5bf2b90cd48c9fa3d22fe6c229bdccb12eec0b22fc447fc27c5f1fa764a9
font_01_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14473 10748 bytes
SHA-256: 0165b5a4404b812a9083e72f60790f93034a2a623f9f72874ccd9c81f5756101