Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff553212f3c38c44…

MALICIOUS

PDF

77.1 KB Created: 2021-08-12 17:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5ef8a9c5aa872c290a5031ffbf2aa64 SHA-1: 741c42aa63274150a562ce51f4ca5b26f6d7436f SHA-256: ff553212f3c38c44b3e142787c6142ccf12705ef3eed37ddf410ce9bf034c381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/877e709ac1b8b901220f334cc5ab2e8b/rakasurojexuxowiguwopifo.pdf In PDF document text
    • http://splogservice.ru/content/files/widajusasagupepek.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/89341573622.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/rorukebajebikofava.pdfIn PDF document text
    • http://tid.vn/upload/files/97096451362.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/duxutapibevabibokime.pdfIn PDF document text
    • https://le27.fr/docs/file/10026031053.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/75977303357.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa76f1f494---pivit.pdfIn PDF document text
    • https://webhosting4.net/media/file/70491260043.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16073170559ebd---nogafololonojisulamug.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/66536077096.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/65711675028.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8ba572cd2b15d1c99787ea9687b78f38/lodevasesenejojir.pdfIn PDF document text
    • http://chinalabware.es/d/files/67018690180.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95ebebd56---41882170627.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210810205426_yucxjy.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb9ff3196---77985028726.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885cbe7645e---rogumured.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/fogutesefuxevafotujago.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79dba1801b---tudiluraterudopivozidewa.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/29729873610.pdfIn PDF document text
    • https://aedwea.com/upload/foto/15236502406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=interior+magazine+malayalam+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 17052 bytes
SHA-256: 716fba12519332d856321249bd281dedf9a2920a2052767c49435ed7ac5256f1
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10800 bytes
SHA-256: 905ee9aa7f25a633b69fb7851c1f731eb0309038d85e263c6466e9d81b0b58ef
font_02_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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