Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77c8b548e434c1b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 04:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d8fb9d4faf50682e248af0788f34a8b SHA-1: 8196f695b12a5071b4eaf3b0f2153e40a6dd0f0a SHA-256: c77c8b548e434c1b71aa5b407ee9b5128eecb33c38d68b8b81d0b3e85bc150a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=black+background+for+android PDF link annotation
    • http://ambvet-trefontane.eu/userfiles/files/butidatibusivebimelat.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84422142777.pdfIn PDF document text
    • https://kaparatt.com/images/File/78355950579.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210914095036392.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/budofalavixurinixolas.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17768171775.pdfIn PDF document text
    • http://elitacasa.it/images/file/fogifupi.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/tuwadobutiwe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14049e86e---rixebosofizigagilo.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/73126262190.pdfIn PDF document text
    • http://www.siposferenc.hu/html/69581908238.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/sojakipolarun.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0acdd8f61---poxelekiv.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gesifizeliseb.pdfIn PDF document text
    • http://hkalc.com/userfiles/nomeburikativuvaxesazemu.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/pejezeno.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6824087d---56500828573.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/61177556959.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24573784397.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210916024652_h0o66k.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/26819667932.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6378d3f2---keroporunenofuv.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/12302741785.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/69768447651.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210917_11308B3422EF8F71.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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 18228 bytes
SHA-256: 77c7cfeeafc5efe8293fc94765d8f9e01fba3b1214d806cf27ba50fa6f2ba45f
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 10640 bytes
SHA-256: fb66069175a87a658e593e28f412b519a907732df89cd65efcae4cb3f922f83f

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