Malicious PDF — malware analysis report

Static analysis result for SHA-256 926d598f3ac90639…

MALICIOUS

PDF

91.0 KB Created: 2021-07-22 15:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a07891c9d38d7897c6a4f79768ac079 SHA-1: 913e7840c45697b5a6cfe4b3187bb9846e78d370 SHA-256: 926d598f3ac9063912492c486e425b301c636148c8de6d27815bc2f8e1dfa5ad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of numerous external URIs and links to disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5d32e1680da37e4312170d32b47c6da0/22682451964.pdf In PDF document text
    • http://yasairamenbar.com/uploads/files/budexinuwefa.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d96e7d0ca78055534ff3929e089635cf/regonifikalavuvedidaja.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab12e8db0---98029527291.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/nafosofozelipabubelu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/25927e5688240ec74320d5eea28ea118/7958752110.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3381c2473a622f7bbac7da9fabb766d0/novumezosu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/t5dnbj8n409m7lv3bl9lvi9k7q/sakibife.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gaximu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/k4nhnu051ka2em0bbu1mrj7sk2/14348812426.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160866b9e55bfb---podojazopedagovijevujo.pdfIn PDF document text
    • https://kar360.com/resimler/files/58699743177.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451957dcf9---15995335593.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/edadaaeb38d2f7f68aef483f7c1e340b/jebogizanufomuxuxinupis.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d7b9526b8ed2e1f3b9c581d8cb0c6061/wobobuzamozokagewurufofiw.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/31702624155.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b75eb8e7e---53223027031.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d1756d59b6a9d1f18da70a50259f4863/17200787414.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sexinizumoditobo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dlpo5lq7hcrpffko91mqcd1ftr/99283021495.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/gupevipiverokubofage.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/25403209272.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/movumulurodesebima.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4900e560b65d173512979988d12386a3/tiponidovaginawenoxomorow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=osteotomy+for+knock+kneesPDF 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_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16424 bytes
SHA-256: cea58a9a582e21c89767f782e23e7677b3c546bab2c7bb26de759c28d7902e76
font_01_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14624 10428 bytes
SHA-256: d1c69bd412996d37f64b965168efdcf28ff1b21489285ef1c4332027c4a4526a