Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a04b897fc6823a8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9ee090ec9c56f2d8fc7d98f6c697cd0 SHA-1: 27b9c05b3e31b39724d9f94f62daab13a85207a5 SHA-256: 3a04b897fc6823a847b8637499927809303147aacc5968323dc5c9b8c01b48fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=jurnal+akuntansi+perusahaan+jasa+pdf PDF link annotation
    • https://havanic.com/cache/fck_files/file/79285796461.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jisivewewafekepitenura.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7c626fb3---67063492247.pdfIn PDF document text
    • https://lapakunited.com/contents/files/palopezesibokidasolanide.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd9f2da44---18382622390.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xidurowazebukusiz.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/fexolaj.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/41977984929.pdfIn PDF document text
    • http://askort.pl/Upload/file/88365841383.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/numusoziza.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a04fb0607662ec52e881b17107a958de/bejezuxudokuvovivuwejufiv.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fbaec8ee056a41922a7878906ee1b0e9/nomatilet.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b692da698---zaruvovorikelekuvis.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/5304817151.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/lifixinaburoniliminira.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/bisawupapawasujolixuseki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b26cc5e1fda---dezudoramuxozotosukireko.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/jetavabowurozazexemu.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-8-29/20210829205913863675.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dulakorakelulonatadekapik.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/ligojavedufikenasobi.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/naveremotajixibe.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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 10788 bytes
SHA-256: 1bdb940ef1474129e5c6e27c898fac40fa412182d925f5d92c7b928e1effe77a
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 17160 bytes
SHA-256: 7bef157a1547c21e41243e8c438187b3647901a442a11dc102d38a7dcc59a927

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