Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc18d3ab84e6dbd…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 01:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef5a79ce7171b38ed34fa8f78a3537de SHA-1: d2620fa1611557f65c5698c21335eb2f61b49054 SHA-256: 8bc18d3ab84e6dbd76b60c7d14dea83f430932c6ef6d5d4f47a9ada6acedfc49
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The presence of a PDF_RANDOM_URL_LINK heuristic and the ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a further malicious payload. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeeaa1f8d---59934441785.pdf In PDF document text
    • https://scalping.ir/data/files/file/tutonaxopalavagegukobi.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/50796290967.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/xufotavunenokijigeni.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/jisuloto.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/wogejizezapejamero.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/mokoxolijetomoloxikusiju.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/9506869295.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/82190374549.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/nijijufufusasi.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/midetagizubut.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/nisikudivo.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/58354113116.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/34493136045.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/rokuzekugonafirorizamaz.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/64271021679.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/64763116220.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/51786012091.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0me65f6pfv7cb7sqruhglahp6c/50881520342.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161400f28226e5---tobotelugiwidusut.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/86076187170.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5be0cf63---87005009185.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/biguritoxoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+tv+cast+not+workingPDF 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 16520 bytes
SHA-256: d96f20aedda7820873d8e40f235bab3eaa65431960302c8a5a68d6090491ab7d
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10592 bytes
SHA-256: 2f5b4450cbaf4a8b8137b48f5d7a42dc4dfae37e1c2e161ba3fb78f589bfe15f

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