Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de51a60491f37d9…

MALICIOUS

PDF

96.9 KB Created: 2021-09-16 12:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbb88f9f74427f2d26ab6bf6d000dcda SHA-1: 59630a5962b78c146be576917aef6a2e0f1f5843 SHA-256: 3de51a60491f37d9503ee9209990b5734b6fc7f9cfc860fdcbd042659a1fd70d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://synerhu.ru/uplcv?utm_term=auto+followers+in+instagram+free PDF link annotation
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/79208820810.pdfIn PDF document text
    • http://chinalabware.net/d/files/85509765506.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/79541639630.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/ruzanuf.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/torigunit.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783fa137b2---70587584985.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/63183157000.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/35294949449.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f882fa6e4c---senixetopomez.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/41585548349.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/31bace7fb56972ce509cabe2ccc87945/10722575429.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/91570187220.pdfIn PDF document text
    • http://uteambio.com/upload/files/26098547935.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xorigokezodojufipirekori.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/62208965341.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/wikugabebamakaziludam.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xuxagodijisolixev.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/92548090350.pdfIn PDF document text
    • https://digiconelectronics.com/media/jozijamabatefowakopipu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc213b0ceb---37548856035.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/matelixizexirixer.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/4963020430.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210903_E69130061EC6A722.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/90572209394.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/loreraxekalolo.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/jiteso.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/15976988271.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/oth0emd544nt1f7saj7atiuhvu/60634316855.pdfIn PDF document text
    • 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_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 18444 bytes
SHA-256: 42a77f7354cffef8eb6127e8fd279ad9b1c74047419a66c38fb473d66ca2017d
font_01_sfnt_off000144b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCA 10724 bytes
SHA-256: d14bad5df829e78f7c6be8432cd84da120d944a4fbc46f409c4925a2552f8d18

Open this report in the interactive analyzer, or submit your own file for analysis.