Malicious PDF — malware analysis report

Static analysis result for SHA-256 da23e6c5c9608382…

MALICIOUS

PDF

111.7 KB Created: 2021-08-20 14:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e9d5d493fdd2207cf9c24cbcff0a2d6f SHA-1: ac71c46bdca44add11c1ec48af0949b28b03b968 SHA-256: da23e6c5c9608382d6b549e4e2af89da0b98928235feeca9ae718c1fe99b620f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://urs-certification.com/gais/image/file/pexirinosujanawexokopiv.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3a28e173---xupotulisapul.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/pekibasuvufiranexi.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/753e2c0d2058411b62771fda6c3ad9c6/borarasuduwam.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/34669543571.pdfIn PDF document text
    • https://shibbirs.com/media/files/kosimufinu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdf3499ad---dofanupisapudugivaxozina.pdfIn PDF document text
    • https://actorconseil.com/files/file/xoradadomepisid.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/68876191674.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/22898933177.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/8203636430.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5dd3dc1872d4a89bffdaafeb66dbf390/10167702231.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/7749807356.pdfIn PDF document text
    • http://schokozentrale.de/idata/dilafa.pdfIn PDF document text
    • https://manenshop.com/upload/files/25242842389.pdfIn PDF document text
    • https://memoservicesrl.it/file/30688042423.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/77122138664.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/92171565088.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/729mpe7m5ej6cja2scdlcrdn96/finosuxojizevepuzafenugub.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0t8muhcttn3m3ag5fglfi69k8t/vajelefumorimepo.pdfIn PDF document text
    • http://intergeored.com/upload/File/tipurufuxibut.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/werakusawepalotaxotoke.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d4n5mfb3ttkmqlh7nn2s0ju8tq/fanafobove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=earn+to+die+2+google+sitesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 2212 bytes
SHA-256: 336773d76661758e2433c6f53221f613faa28c4e3c74c5f2a095a53147ebed77
font_01_sfnt_off000149e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E6 21400 bytes
SHA-256: b53d892f61557e27cbe1dcc696abf959db34c1a2980c6b596195eea2e2165172
font_02_sfnt_off00017eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EEB 10524 bytes
SHA-256: 3e225cb6ac90acf90aa780a7f2f4f8ff476ce939534fcbd3fbdd1e48f878e1b3
font_03_sfnt_off000196d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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