Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3d0ebc846faaf7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 19:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7b292d3ae5005317de71f146f55383a SHA-1: 2a422e7eeb798ed3cc69b542de21a52a965cfedb SHA-256: da3d0ebc846faaf71bcd7e83c94c5e7b80f8a7286248fb11b93d981ec1dfc923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/91154254918.pdf In PDF document text
    • http://nriloan.jctoursandtravels.in/files/xubokabelafebaz.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/nageselawot.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/39078449940.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nanixuligabosufeve.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/18009758720.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/15523919477.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/bivanewifimifotavapu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/tosavija.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/75578744295.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/23433379649.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/pekidakiwifusipuxo.pdfIn PDF document text
    • http://tecksco.com/upload/files/59058438601.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/38665491572.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/tupitazepo.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kotizetidiloget.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5c639aa5---dosolu.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/77589566535.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/12719656015.pdfIn PDF document text
    • https://unitjaya.com/contents/files/vabobarubi.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/31832155209.pdfIn PDF document text
    • https://olterus.net/contents/files/sajorozexajakakisilow.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130e12b588---58891231376.pdfIn PDF document text
    • https://ibextrail.com/editor-images/69070599037.pdfIn PDF document text
    • https://majubesar.com/contents/files/72538204201.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/loa85dgmibv0fqejfe7drhueca/losezumemeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ielts+writing+made+easy+book+pdf+free+downloadPDF link annotation
    • https://lapdonline.org/file/58651645058.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_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 18140 bytes
SHA-256: 0ab5ba38a9aa972ada34a540af7f3c8f80e7c084526cbb06a059fa4481b2d05a
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 11224 bytes
SHA-256: 543faa59c7b51a22e872410ce41b62f8160acdc44fa17f9827ac1d7e28e491d8

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