Malicious PDF — malware analysis report

Static analysis result for SHA-256 639cd11f0fcc2571…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 16:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0be3bd08685b90cfeecd86376af57e82 SHA-1: 5670b77c5eabe42df3ad6a1280b2c024a7b5ed4b SHA-256: 639cd11f0fcc25714c4e2fa2ba5c8f0465070c554f1a71ce09a749741d2d70ea
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=hero+malayalam+full+movie+download PDF link annotation
    • https://grootformaatspandoeken.nl/userfiles/file/lupubevu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377235c341c---27986012476.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/29df2fcde0198d06c5f49a7202504d36/3100821395.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378e5f89af6---repaguwaverawazoleb.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/14066169734.pdfIn PDF document text
    • http://wohingltd.com/userfiles/xaxuvuxanizeforozinoralew.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/tawaziw.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/4314065899.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144424110526---69132764319.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/93893410274.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/daluwomog.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210907_ABF7090742ABC5C8.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/60023247071.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/73723650851.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7791aeef5---6924125792.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawunejarikodez.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/watixokafifizevagu.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/79607408734.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/59458882098.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/31625435051.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/paboxakanenuju.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0c85983f---1518562429.pdfIn PDF document text
    • http://ginniglobal.com/uploads/file/xifimotevubumuk.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/12357739276.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbd9a57b2---93238437325.pdfIn PDF document text
    • http://www.puhito.hu/uploads/49372964223.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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 17516 bytes
SHA-256: 131eaf9f9303eeb621b7e99ca22dd50984c987fcb9b92c4264e9c5c51a57d5b0
font_02_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 10604 bytes
SHA-256: cea148119790ac7e8e0340fa2b70992e9dfee17d2b28d6ae82e4e2e75b55fd24

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