Malicious PDF — malware analysis report

Static analysis result for SHA-256 3505d6afb7cd5b63…

MALICIOUS

PDF

94.6 KB Created: 2021-09-23 21:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a4fbbf9974a8500e1122c8464b9d2c35 SHA-1: 9fbbc55aedf65ae3d0f6f3778d315e91953e7b38 SHA-256: 3505d6afb7cd5b63f3ea6acf6c6dce2f26d4adb0264d4455d1b90f7a21420d57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://unicorn.mn/js/ckfinder/userfiles/files/61983625530.pdf In PDF document text
    • http://kamakuralosgatos.com/uploads/files/batalupebibefiwojiv.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/7924078261.pdfIn PDF document text
    • http://idcla.net/upload/files/43122232297.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/064vmdbvfo9ksp6q019rjpnv9i/80382886234.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/zutiraleridoranan.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/vibiputigofexumu.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/kesikafamaxixos.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/88h699seupr8vv1mpg45kv22v0/66100517121.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/19990981582.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/siminafikoxe.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/vokim.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/kejuremazusare.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd4005c79---gitaxutuzalotapebaramuvu.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/42617746464.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/94f3228fa0d1e1a0530bd155eb559f1a/58308408771.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e4cb03c10a88d4ea50982aec1999a627/49066364713.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/56815945940.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915234451315419.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc1b1f7a4---xutupado.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/seroge.pdfIn PDF document text
    • http://topflexsports.com/uploads/temujebexijumafosef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+lunar+chronicles+scarlet+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_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 10780 bytes
SHA-256: aa888ac646a0d85db32867d07389685f0aa84df5073bb0e843a3e58104ccee4d
font_01_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 19348 bytes
SHA-256: d3f37091751ab000de0e93b88d1da50284f91a59c035f6d508c61262caa8d62d

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