Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccde318f4824a0c7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 10:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 37c0a2715b20ca5a668034b89d5d7fd0 SHA-1: 4175d17c1f3809c1b595085b6c0699bc3ff17736 SHA-256: ccde318f4824a0c766ffdd83f1da45c4922e6d80aec977f1feb456bb1a7c82df
172 Risk Score

Malware Insights

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

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=paulk+workbench+ii+pdf PDF link annotation
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/397d3b51402231c649085530f8a90926/82732241984.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/99364088857.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d7524009b6bf9095d07e99c61cb9a91f/41560902965.pdfIn PDF document text
    • http://merwepizza.com/upload/file/fosimirilevipuwetulibi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/tavifizagawigovubebu.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/26132912665.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/97447995502.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98958363846.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/29682850723.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/xujinokepe.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/gakag.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/25620181767.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puzefutesukexopo.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/41276917626.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/mizotonepuxunixuz.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/depikukenijim.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72ca428b70---68030273565.pdfIn PDF document text
    • https://lesura.net/userfiles/file/78199654601.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gorezatokipijopuk.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jitit.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/tunod.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c565f664e44---litapetunigugezuzusabe.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/55218405780.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/999ef7fce2c1e8f91bb392ef02f97be7/vodubu.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/fudifogetew.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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10868 bytes
SHA-256: e24ac76ce1e12f5baaaa1635cf46d3c7d2cafe4addc59c25de8d1ff7eceb3db1
font_02_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 17396 bytes
SHA-256: b0e246e6075de74178b99fa4e35304952e09099e4b04f988f2013e052b7cb4f0

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