Malicious PDF — malware analysis report

Static analysis result for SHA-256 388c05859b8169e6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 21:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce9c191219f43a04984a5921f953456c SHA-1: 1a53436fdcb0105cada8e54e02a01c3017e11719 SHA-256: 388c05859b8169e66470bf11b1730855464657e9f5a92b5b3f3d2d463bfd99a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=my+apps+are+crashing+on+my+android PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b629447---zenonusejodunisorawu.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/65956474195.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401e08f3240---pijugamono.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/53614216819.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/pagomenatizebodotibegu.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/lojoberuti.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/27611665141.pdfIn PDF document text
    • http://sswjeans.com/files/jigudebab.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/58510637469.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/47314805276.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/76f82b92564d2eb36f231f278cb211b3/netagarulutijukokujukor.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5a1d57d2b89d280b060a5db5029e46c9/xizewudaxojeduworirep.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/refimube.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/datonosadakewosatumiriro.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/pemutudevusenunimo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rvr3clqovc12vikqjssflmpklg/sobusuvezegozosebezuvus.pdfIn PDF document text
    • https://subded.org/userfiles/file/6277164033.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xupexelotijamepokulizefo.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/48400981563.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/vodakewivuxawovo.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/35107786785.pdfIn PDF document text
    • http://fourfoods.com/images/files/tenusavarotujivopiwefipu.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/80844580469.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/nokozudupizolituxi.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/32429905167.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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 17900 bytes
SHA-256: 7f0f270adfa36033b144d66f68eb3fefb8dd8512109d7741713f0c425e742fdc
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10924 bytes
SHA-256: b17240bba039e95ee8a7f76b939f8947e403aeedb7f20c6631cb00bedf2c5824
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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