Malicious PDF — malware analysis report

Static analysis result for SHA-256 20563e16a4cd913d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-13 17:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6de8359bd4dd9c780656c19429ef00f9 SHA-1: 0a3d735a1afa77987483d43eb0ba552c8fb4688a SHA-256: 20563e16a4cd913d5acbab444dc7f37d2ba18ba97841a9579bc771fa051e522f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drafthe.ru/uplcv?utm_term=what+causes+weeds+to+grow PDF link annotation
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gemoz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca9e0d38c---83000768783.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/33e75494a199e568e441b99cfd7418c7/8719446101.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/82953976445.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05c5308fe---11852660034.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4cd4f0c458be6b314d5a117e9839d439/molavut.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc9mnsa8pgdei31lumiju0h1k7/koponekidepibikupul.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ki1u27u2g4votblr3rknr2lrtf/98535143936.pdfIn PDF document text
    • http://4bx.pl/public/file/janumisebapuv.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55686179845.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/89340405282.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/23646366161.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088801a7b2a4---punabojadam.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375fb3d91---96415307762.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d375593a---fibuvirapibifesuzokusisem.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f501cd786a8a2bd3db9aa1ab7ce520a2/gipelimirimofepil.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bacdac3299a---75586503921.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/wedebogafoloz.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/62221714030.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/1642549678.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0b978868---87237562258.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/namuwefulojojibidotipulib.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/puvobivirikavumog.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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16836 bytes
SHA-256: 516d42de633286d85487ac6ecbd3fee8f96aae2284ed72d02be100f260ca8da9
font_02_sfnt_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 10584 bytes
SHA-256: 9443ff9deec6dc7cce2b5582b7c4e1b0b728bf514904d111cf8c76d6a95d3972

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