Malicious PDF — malware analysis report

Static analysis result for SHA-256 912a9a03b520d758…

MALICIOUS

PDF

100.9 KB Created: 2021-09-07 19:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 524a32e10e890ef05f28cf3e65229946 SHA-1: 4decaea59809cc51b6bdac69951355f34e0cc1cb SHA-256: 912a9a03b520d7589cefa63c57bf598d89c9821dc0a393ffeb4d217ae55954bb
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to potentially compromised websites, including a link farm hosted on disposable domains and a link pointing to a compromised WordPress upload directory. These elements suggest the PDF is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://okeefesreef.com/ckfinder/userfiles/files/97640780624.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/6967788912.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628134950874275.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/90229441879.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/zaguduwata.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/xosejodivakikawuluzomujod.pdfIn PDF document text
    • http://makaroma.fr/upload/file/83331555326.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/98911447559.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/v6gis82grsvbt27tgphqgn01p7/89380961601.pdfIn PDF document text
    • http://ativn.com/upload/file/dikeziv.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/mesonefedobofesi.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/vezoruvimutelizekexek.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/mijog.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/fazasugomaluropejerimib.pdfIn PDF document text
    • https://medtek.vn/storage/file/xaguzufajikiwolizekutero.pdfIn PDF document text
    • http://classtool.info/upload/files/35504063055.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0a870483---sirifoviviji.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df076be9dbf---38734769921.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/28166789555.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/dudizapikijenavuxese.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/luwezoxokuj.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/wixalobugetum.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/16324642058.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e630a4fc52ed355ccb8d627367ab1175/42337516937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dell%27arte+della+guerra+machiavelli+pdfPDF 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_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 18144 bytes
SHA-256: 53b86bb73dda12c5d1f7d8e9f2ef1192c83f5b6e1fe6e2aaa137ef8e7a306bb3
font_02_sfnt_off00016c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C59 10876 bytes
SHA-256: 7cb91300a377195a62f046c4c36e6749cb513292fb2ce3b1f892b5c7059a8641

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