Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d571cf575053efa…

MALICIOUS

PDF

102.7 KB Created: 2021-07-18 07:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bbe7b2bea919f7b02fc15d4d9dc2026a SHA-1: 51e13f534d5a782fab5c6267b15048c43921cdea SHA-256: 3d571cf575053efa6e8f9f9ab2cb480bd246b4a6250e82632a5001cc92934fdb
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of a 'download' button heuristic further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d11e73360a82e294fafdfcbb312760cd/3146772601.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1533d8d1b79e6950298aa7bbb6ddea37/58892656886.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/93519919478.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7af752b8---10602455264.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/el6l10ogvuru9ujbv936kscarj/4070866508.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a20bcbe10---23147020910.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ae8d407d---febasolinavizumojon.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kisosasivipuduge.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/bepigerimowaximuxureki.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/ritaxolemuvomolax.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160909d2b736f7---zoxotutab.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/919370a5ae85c5b41c47cfce9ed002af/vafezabiviti.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/45344395286.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/xorewekebo.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/suromivibifu.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/xovuvukolu.pdfIn PDF document text
    • http://attlas.center/userfiles/file/defajekujutepisekixuf.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/vafonilariwepakarigisek.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/tolenevafabazonem.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f3258421---71456847567.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/47265404272.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/73872487571.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ad58f19c88b3c65bb03539d90cdb774f/vokugupofinalub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=degree+certificate+fontPDF 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_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 20660 bytes
SHA-256: ef142916d6f429c345a38908fb97069c8f3a7f6e88eb6de79531a8c6b95d822f
font_01_sfnt_off00015e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E07 10296 bytes
SHA-256: 592030147d2302e8934c8afded6fc1112dff649159e1b4c419965fc50f5f4c4b
font_02_sfnt_off00017561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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