Malicious PDF — malware analysis report

Static analysis result for SHA-256 efab9a060ff5c99c…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 15:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dc08bedb510bb6d77d929f4ddb104ad4 SHA-1: deaeaaef23555fc88e3a8cfa7c78d3c975168193 SHA-256: efab9a060ff5c99c6422746cb251b0198cc2b5cc84f0286a4309a791032a4342
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=e6+eval+opening+statements PDF link annotation
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0fc7a719---21962066228.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/lexogotuwasaturepa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j3u7h3qgbh098uglvqn8lnivp5/89714200337.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9cc4e53d2---fitotatof.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3178260d5---20288368772.pdfIn PDF document text
    • http://esistore.be/userfiles/file/29301544537.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/66497636472.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/9517954390.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084968e3be77---bazuvokeluzami.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210604025430.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4cf7a5e6---vaxatunativifod.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/61053804276.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8bdd8fb71---80008860024.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390122586f---43822336304.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/42cf6f52406548fbb986ab9df1a5c98f/3071924156.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/88750274033.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb9590f022---67711618430.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/edd97a18ba2c0ed297966370271aacee/24397432937.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vadexupopuxek.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/mafefilewalus.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/71969689968.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/562d895f8ecd38a69246b9e16ba9208a/guxazulojipafupalenina.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/faperu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/ditotero.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 18424 bytes
SHA-256: a159b3c5855920ef006a21e5622b191ec087411e53aea2058e30e54d4017bf03
font_02_sfnt_off0001589e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589E 10712 bytes
SHA-256: 5c45485789bc80b085f4c4c48abd3028a7232a3019b0c55a43aa2fcc33944a8c

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