Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd43b1d50621a0d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 05:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3caa17858c7ca0e5660db6a4ae2fbc04 SHA-1: a148b589275d528c4a299bf78c7d34b11ae5f6a6 SHA-256: 5dd43b1d50621a0d07689080cd0e383a19b19bd1e6c08844f07edcf83d9e94d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various URLs hosted on compromised websites, likely for downloading further payloads. The presence of a 'download button' lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.gamylai.vn/uploads/files/45651843848.pdf In PDF document text
    • http://sushiyaslo.com/uploads/files/39226379784.pdfIn PDF document text
    • http://samtekelektrik.com/files/54486195979.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/4984758228.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/mawavaw.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/17395124775.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/47678507847.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4756cb83d---wibufesixokukivavax.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4ce8c585---wajeralad.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/32778383563.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lujuzufopejaledavasap.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/97225220427.pdfIn PDF document text
    • http://skncn.com/u/files/ropakuroxafoxagal.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/faxurimililokolix.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/48048764537.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/wamusuxufiluridod.pdfIn PDF document text
    • http://creteotels.gr/FCKeditor/userimages/file/45040723181.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/ruvaluvezenatowesimef.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/nokasebudik.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/40820886211.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/nimusus.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/fodisim.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/peube4ereeke346lvpbvvkklgj/1658947862.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/dekimusogemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+five+download+apkPDF 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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 10508 bytes
SHA-256: d0eada3d767217780fb912ea4a5d156bca6071e42517cb0a14b9dd946e5b3d0e
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 18668 bytes
SHA-256: 828befe85866e9065717831295783621187f86f99fa79d6f686770de8a2a386a

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