Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecbb5d8978782ec…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 12:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b74696c234cf0d7f45b1d49d41cf3ab4 SHA-1: fa4b818c20ca7f21b4a884d9cc07d7c6f71b24f8 SHA-256: cecbb5d8978782ec9a7b586be0c3847030273bd68898ce0cf30cf04a6bafb6ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=scaricare+applicazioni+gratis+su+android PDF link annotation
    • http://rayanchem.com/d/files/norutufobebop.pdfIn PDF document text
    • http://rhondachem.com/d/files/kilin.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/zemop.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/77708015634.pdfIn PDF document text
    • http://egitara.com/upfiles/files/71571534086.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/zaxepamapejege.pdfIn PDF document text
    • https://kondoreskiss.hu/term_extr/files/bomalikokagorefelirezivux.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/70634137423.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1b496773---retale.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/dofow.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/mitisaxuw.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/71709033383.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/gedawerefonilifabepevatek.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/87k81fguhnvv36f6big3m4hf7k/92693460143.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/42624014956.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jipidajeramurikep.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gabuxogali.pdfIn PDF document text
    • http://domosplast.hu/files/file/28654485831.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/97720138842.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zoranepuwu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb1edf1eb---62745130934.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/zewepexakamijidiwuji.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/90869741374.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/wenix.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/xixebisojozolajelor.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_off0000b3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 15748 bytes
SHA-256: 35315bde8a538b2d71ef3da5197264a55adc0161a485e637601875455342de90
font_02_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10924 bytes
SHA-256: 68c8e9f9143daa1b38bad4818313e1d33f42e769dc5e391a74c60277f717ef3f

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