Malicious PDF — malware analysis report

Static analysis result for SHA-256 502b49eaa48e8774…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 09:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9b25ad4d9fa0065e3a30a72c002ba08 SHA-1: e1315e6a02559b1757ba7e23e31cdddea5803988 SHA-256: 502b49eaa48e87741b3915bac20d2b2d5835ed164d4f45f65abb21ca0576b5c4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that leverage SEO tactics to lure victims. The file's structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=how+to+print+2+pages+on+one+sheet+pdf PDF link annotation
    • http://slavutich-media.ru/userfiles/file/77484769941.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/47608896256.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/29743770558.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/68470764468.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/85703798194.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/21315691663.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/350086c1c85a8d6d6ef557af4dd9b349/81695259204.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/62349378265.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejabe.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/xazimeselimopipalav.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/desolapedib.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/83661180409.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/xepotapowuxasidir.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141615c164bc---18540728952.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/nulusazukadukajufasenowot.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tususa.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ximida.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb8dc0557---bonetu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xinovowolomebofuvebot.pdfIn PDF document text
    • http://arucax.am/user_images/file/levuteropax.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109021736432249.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/37559898275.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/kifexowewisosiguruw.pdfIn PDF document text
    • https://tcremich.lu/files/files/65459923470.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/46643843643.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/dozilipunopunoregoku.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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 10928 bytes
SHA-256: 74eb62c78fff069d0e94bf8991500c4652e633a38e839d2e05b45a5fb7056cda
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 15704 bytes
SHA-256: ffa72c61c08f08ee0953c45d511205c9e7ef1d766407f2c8bc92d21753cfbde6

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