Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce26f88bd27b77…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 12:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2940db32ed5ae0946bd4f56e2d336731 SHA-1: b8d714ba138c44d259c6c9d0eabbfafd21f2ef72 SHA-256: 66ce26f88bd27b7766f40a825b00d4b0ae2f1f8bef8eb3cbfa9dccfdd7e4e2d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure of the PDF, which appears to be a link farm, support the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://garglob.ru/uplcv?utm_term=multiplication+table+2+worksheet+pdf PDF link annotation
    • http://stinpo.com/ckfinder/userfiles/files/25398429970.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1bc7299fe46bf7d5b1105f87053df3ac/wagivo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a9fgafljv2nqmuk5d0fk4j8oqc/29653944733.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e12071d5ad6---24327025437.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/22896175492.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/tojuvunaxiwutiwujarewo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/zagajadilamerededem.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rusarifezofegug.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d166c3a2ff---61167732793.pdfIn PDF document text
    • http://canvangdientu.com/images/file/42325497312.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bj3p84fin1j4rqjuf2t24fu6ir/duwativazuz.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/jibidu.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88997861993.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1cfc43060bdea830ffd18ae003129733/12167024612.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bd8ec6ac---nelezopiv.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/lorazubiwum.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/enmhepudkqv7omuii8d9u89esk/gafenimowiwezux.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/sagejej.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72e5d6533.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfaa802a6f---kekasuvuzulu.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/mojisuzeda.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/tareginesevomidakumukibu.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 11248 bytes
SHA-256: e3e07301c0452e5e7fd731491681562b65227c5bf4cd7fb0a96d9e3ba67e0fd8
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 15864 bytes
SHA-256: 59b6573685bc25ef48fc5c69285985148d93b14a4c9d5e4d389c613a88cef910
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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