Malicious PDF — malware analysis report

Static analysis result for SHA-256 48478c373a03c0cf…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 06:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5435a8cc3514539a485b8fa5812b5b51 SHA-1: cb6759e896434238d982f214fd913004812ca10b SHA-256: 48478c373a03c0cf7d41a493fe25cc5412df5981011161ba8215ebfdf67c27e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://balaton.varosom.hu/userfiles/files/winubajebesusasutavekaz.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5ab4c90a---3662075297.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_6E27419541B34FA7.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/fexubinuzotigaxamika.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/16df6256f2afdce4cfa16ecac46c4e29/7399736800.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/31997903982.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/nudevepani.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/lobapomiwuvex.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/20608186032.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/78513494754.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/62316903417.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/98516083189.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/faloterusodo.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/54524063077.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/56845051137.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/85b54855c1665aa158a0d2c742674c92/92263838675.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/38417537192.pdfIn PDF document text
    • https://designclarf.it/file/kupegefonadevofunusibug.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/89075521898.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gobapof.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161539e1b0f502---jubekepupale.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/sirinewosabom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+for+pc+apk+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 14756 bytes
SHA-256: 4a8ee5772ac853484dbea25bb8de9a1d1c58db164056dd1230910ab04d1158aa
font_02_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10604 bytes
SHA-256: daa2d73f93474c2e57949ce41a8fac0e1dce0e30921a48c88ab87f12d06ceb0a

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