Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6911694fc70da79…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 15:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 053ddaa9f0974607ce505495a048f922 SHA-1: e318bf36fcf98bb3281911ed83dd3d013ddcfe39 SHA-256: c6911694fc70da79068c929eb2bec36218c7df26b43f4178cf4255f84428b3b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities to redirect users to malicious 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://philabc.ru/uplcv?utm_term=charlotte%27s+web+test+pdf PDF link annotation
    • http://konsultacjenaukowe.eu/Upload/file/fobadezoviwugagorasikiv.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/10647279903.pdfIn PDF document text
    • http://inistor.com/ufiles/files/zomufalaresoda.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/fupujigabezoj.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/88789185806.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/giveriri.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///81544336938.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/46235486151.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/97840170788.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zutubiwix.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/giwixexile.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hctbfcaientmj9avk8rdoj6u4q/35506435330.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362f1ae4dd6---36229814547.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/paxeduzujirepu.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/kesunomor.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/62156161862.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/42112318056.pdfIn PDF document text
    • https://mbbs.hr/files/55296428353.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/82429396358.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/wekaferudijavivazaxisulot.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kovilabuli.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ce6695a7d0d66bc0e7140b9e485ca41/29032972146.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/46597233497.pdfIn PDF document text
    • http://prompol.com/media/file/sebazufiwadorelego.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2e9fceb---58513296275.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_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 18320 bytes
SHA-256: 5b5a34a147c77232bce0836d65a579f36bdcb7c98bd085425a8d9fe8aca3f28b
font_01_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 10688 bytes
SHA-256: 64d01c0407dcb51bd54d3c791a4236f27a1220198e1ccc4d3d7164e5c7cc251a
font_02_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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