Malicious PDF — malware analysis report

Static analysis result for SHA-256 9254011ab5cc9e85…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 01:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52d69bd77cc49e231b4d4c80123ea8e3 SHA-1: 49a69f31df2fe96fc7da24b808a1916738951b93 SHA-256: 9254011ab5cc9e8514baaf1ddd32d47db903cd3e54d8698c2f0dbd265544f316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The presence of external URIs and the nature of the heuristics suggest a phishing or malware distribution campaign, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138deab09dfe---zepozotup.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301903e9c00---mavazoreximexavulogebuxiz.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/34439061604.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/jurasaxu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161362fb7aaba0---90448268446.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/35674435576.pdfIn PDF document text
    • http://synphabase.ch/upload/file/56127405622.pdfIn PDF document text
    • https://granitnet.hu/editor_up/34656161049.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b1a07e87---xebozeli.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/xapugamenewumekumep.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/93605468255.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/52659748341.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/fefulojevul.pdfIn PDF document text
    • https://superpart.com/files/felenedisuzesasuzax.pdfIn PDF document text
    • http://artepcb.com/upload/files/wopewisuso.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/fivegironover.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/dexuzoxabuvijagigaf.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/mibuzotupuvat.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/nibidujovurifowotesemogo.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/6384169666.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3bd96f88---kitunuwubojisus.pdfIn PDF document text
    • http://gibisch.org/files/files/30374605205.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/12320146728.pdfIn PDF document text
    • http://malifer.hu/upload/file/nuweziladewesuzeludopegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+dune+online+free+1984PDF 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_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 18108 bytes
SHA-256: 81ab1b67d7d0cd9f1f66046d2a931a0b8ea5a83eaac5a502105cc7e53d57c82c
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 11004 bytes
SHA-256: 3744c3cce7de0a438da3bca72ca4899c3cca1fc8058028d03b1dd9c97127a89b
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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