Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10f528cc34873d5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 13:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e783106fcc56ea247c363b5356269d7 SHA-1: b9967e83aa7f2a6f4e5577cc49073a4fa81a875b SHA-256: c10f528cc34873d5b04488764be6b4133bfc92a375122740eba82f4501b90f98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results or distribute malicious content. The embedded JavaScript likely serves to further the malicious intent, possibly by redirecting users or downloading additional payloads. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=capsule+filling+machine+manual+pdf PDF link annotation
    • http://thefjordbaklawfirm.com/clients/876731/File/pewojeda.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/41592461504.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/28278157611.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ff473c96cd1f17b137e7b08ff1267a0f/51187596676.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33279779364.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/84729319047.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/af05f93365f6c44bbd9dcb0a2d2fc106/xalibemiloniwefutonifexo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/wumufiwegefu.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/11593420932.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/08250567a2ae4779ba091c91d3a4bbf8/60934840192.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e66d46fb9065fc264e6b699da3d72712/verosudozefazabigej.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/bovazedowafivejelusateleg.pdfIn PDF document text
    • http://4bx.pl/public/file/dejitorijovazixexidif.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d96907b9882d5c4d26fddfe61fdf5f/rujevetorolulitatatip.pdfIn PDF document text
    • https://schmitz.cz/res/file/varitovofet.pdfIn PDF document text
    • http://hevolta.com/upload/file/87244465477.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/zanalodenumikeduxutexaser.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f8f457fbb231c35b53d272f56d0ad312/80383894564.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f8f0dced3178e23914c2ef8a841eb05/60390882893.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b596567050---vugiwitotufidufov.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/jezapisifef.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608729775a42b---botifoke.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/napudedowefowikev.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210801044246.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74028a51aa---49490906645.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e14ad1585d6---84719806712.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 10880 bytes
SHA-256: 83507c54753925f13aef427c4e33b531b9d40d52046e384f43498446f7a3bd09
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 18420 bytes
SHA-256: d88d38b786a99f3ab614f7d526a75bc8369c91e262293dde93d067c86d602ea2
font_02_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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