Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe388248549fae…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 06:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 176fe7e0d8c9bfd04b1a3ff3e7c324a5 SHA-1: 040789104459213fea260736ff9b3651313ca0ef SHA-256: 75fe388248549faec59950c79d64c4110a6d0d99f7ee9222a3c780f9a1c667ab
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains multiple links to external websites, some of which are hosted on compromised WordPress installations, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c285b904e6817bc66ccb6afd456c4fe2/fadaz.pdf In PDF document text
    • http://yaan121.com/uploads/files/202109130604472788.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210907090402.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/fagogovip.pdfIn PDF document text
    • http://husplaza.hu/editor_up/silava.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161346c137a739---92266151072.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210906131119.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/mevuginufekufaxilenilo.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/6944295129.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631866696.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/nelalimofet.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/74662921000.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/viruvo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6283809689.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/39921330392.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/puzaroxelafekofug.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/rulogigezevodo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/43379696822.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc316172d---moxurovizamejuzojigox.pdfIn PDF document text
    • http://staropolski.net/Upload/file/53368811266.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/94c19392546993e84a539488de9e6256/8127393122.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/zonoxojutibir.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/kakova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=3rd+person+games+androidPDF 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_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 10668 bytes
SHA-256: d569bc8fb986d606bc440fa67b25ee6f99e41f7317bdba3d8e56393f08e308d8
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 17172 bytes
SHA-256: 45122167cc9832766bb42f7f8737bc4c238a45ab97d308d4361959e11eba2029
font_02_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1