Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79af7744fc34eef…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 18:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 661551e6166c9c7fdd1758f026474256 SHA-1: e9b8dac85a4d46f6902c851ce9baac1b017958d3 SHA-256: e79af7744fc34eef77f0d721c48e422911945dccafd0cc117bf93ee503ded107
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=la+vida+es+bella+partitura+piano+y+voz+pdf PDF link annotation
    • https://widerbet.pl/userfiles/file/14616614049.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipotijilopetojom.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81142605476.pdfIn PDF document text
    • http://preiss.at/upload_files/files/sanonuzoxitobe.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613650107c61b---tamuga.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/20796204389.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/80067098209.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/60123614342.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902164652.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/19628638621.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613317ae387eb---47866655852.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/95390957161.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b0ae4dd.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb870da424---togozatadotixodirone.pdfIn PDF document text
    • http://alkanboya.com/files/file///rawaliremo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136502c24ca6---45826702006.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303de9593a6---17733051155.pdfIn PDF document text
    • https://norservis.com/files/files/61732409481.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/27649997394.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613519d4c7e18---velutimagonobijakiga.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/nofabizonogaxowabikine.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/16983656511.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_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 20248 bytes
SHA-256: b1ea6f813ef97fba7fe236404c45c58332dbc0e3cf43044a4b72ee4d8e7613aa
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 10928 bytes
SHA-256: 5dbf828227f1fe970c090bcc58cc68e22e7f49f4e4fd7117c79c56cd1cf51ea6