Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f848f19f8f2607…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 08:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2018e93e62dbb7acad19c10181a6ce8a SHA-1: 7ed403948887da72859944935449a2d90d50b189 SHA-256: f0f848f19f8f26072c807c31a06e9cd669fe806cb5f43b75060b4898bfe5fcd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://pixomot.ru/uplcv?utm_term=mumbai+gram+panchayat+act+1958+in+marathi+pdf+download PDF link annotation
    • http://braciszewska-klimek.pl/fck_files/file/67859090534.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/34968875475.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7cb91f1e---xugawogiroxasig.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/34c2c344d05e1eef9575251fa89543cb/xuropo.pdfIn PDF document text
    • https://cubic.is/userfiles/file/35935054219.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lasugezivutavegapato.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f9c63b0b---36165538090.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/lamofixegedorewapesofobep.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210605192449.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/mezilaxa.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fijaleritidabor.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b5851258---7485025073.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f1a14c5c5471719581981fcca7787fc5/76590550058.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/jirelujoxosixekodareb.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/20818816248.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/87491129878.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c558bbdd35---45731203150.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5e59dfb24f0c43054c12f3e9da9d1fd5/fobatanojidovumesoxakovo.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4238150705.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a4aa90b964a477caf37dea1c9242859/fegikugilaxarodesukotej.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/63068594082.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210828_0B52AC34B858862D.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/12564393825.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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 11760 bytes
SHA-256: e3a340dd4944d2c9bddbffbac2a981296991672d1a922f82bfc4e36ad05a2ea1
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 18964 bytes
SHA-256: b64dbc696693a3185e6f09ef885787bcb1c892bc5f86627d4dd337cf4d4b8234

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