Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1790ad9f1b50e0e…

MALICIOUS

PDF

76.3 KB Created: 2021-06-21 19:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 469c2ddcfbc5463db0c789ccdf393561 SHA-1: 7054dcc7f98e5978106fa871b5ffbdaf1f786033 SHA-256: a1790ad9f1b50e0eec401598af98b7f75c3a9340e1060a72653adc82c505a7ae
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document leverages a link farm strategy, directing users to various compromised WordPress sites and potentially malicious URLs, such as 'https://smidgel.ru/uplcv?utm_term=windows+10+download+for+pc+64+bit+full+version', under the guise of offering a Windows 10 download. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to a malicious download or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=windows+10+download+for+pc+64+bit+full+version PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75aec7396---tetate.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/014773547e2ad2627b2920d2e068b3ae/xalakuxosuwowure.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uvhq7p2vr0c33o3av5m3utat05/numikoz.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/56383127173.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106181520121147.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841d747d37a---64336479374.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/koposetixiguzelam.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc5c4e911---fafobil.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d078b8f9d2---40796162163.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8da504e3319e198ad30e50100e768bf7/minamiwewipupizijugumufu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fosawo.pdfIn PDF document text
    • https://hsse.cl/files/zabusagunesola.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a048027cc2b---liburesilobesibikonoku.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/aa27194903f723f529910d0cbe69b3a2/jubudukigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5888 bytes
SHA-256: 7e42610850cafb4f7fa1ca67bcd2a2efd415373704de87861a9876aca485f8fa
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 11072 bytes
SHA-256: 68972e1f675ca5b87c11b453b7c7b3a2aef93e9593abde48c35fcdd762b556d5

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