Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da74b6ee6ff431d…

MALICIOUS

PDF

95.5 KB Created: 2021-07-05 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2011842c75f801461b167141ec26f39c SHA-1: e84bcf05d56c269b8e4befa7cd39c36e9b2e2145 SHA-256: 1da74b6ee6ff431d60dd22d556fd58d5358b66b9298f19200c50317dff7e9e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the file is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=smart+time+2+student%27s+book+pdf PDF link annotation
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e2f4fa1bd5664a46692cb81b2dde028b/modajekolekab.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kabirava.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0d2c2379---sulozawarokuxaf.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/15401389402e5f4bca45bc58fe36e54c/nedaxe.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/11484087246.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qjdbco7uujhl9f6ne7h4shdt9o/vomoretudazisetigobigo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ns1mflfljujms2lc0oaa7lsdfv/galejuw.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/kulefarurutufaw.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/binimusipujikukijijis.pdfIn PDF document text
    • http://jestbogiem.pl/app/webroot/uploads/file/38593829290.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sebapokadapatobiriruxu.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/sutudi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f36c9d30---zefozevumamopizofamij.pdfIn PDF document text
    • https://aneri12.cz/res/file/fizujedefixezidel.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984de87e550---bolifafolamuvipag.pdfIn PDF document text
    • http://poorclarescork.ie/images/tofowuxuluxotumij.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3578d3bac---lutesonuju.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cdcea582---43921043442.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/gibapugemewapasijek.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/69429627785.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fc0b5ec---10334133360.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073b420b0a43---dibawaxozowuxaf.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/354807f3751096ed97733b1b37f72455/dogobefajesulenalivu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/pulijikezizoruxi.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_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 17432 bytes
SHA-256: c4dc14fe156fea8b805e1272f4c780b5424c3f0f19ce1a42c0e3c6d0cc2da391
font_01_sfnt_off00013eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C6 11176 bytes
SHA-256: a958ecda3760c6a3c89a4cfb0226fd8e42a66d0c6a83435a43980ec7fc8cb5d5

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