Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccafc8ee655747c9…

MALICIOUS

PDF

78.0 KB Created: 2021-08-22 03:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4cc66e0bd9084c41a1460edad3f11b04 SHA-1: c36f7e61ffa22232bd6cf05588de23555a255892 SHA-256: ccafc8ee655747c9d4f6990d45961cc3c80e884585e92604e11e90bc944bb418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external PDF files, many hosted on potentially compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and extensive list of URLs point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gidaero.com/upload/fckeditor/file/jekeburutu.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/22283992889.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/tesij.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/89735392485.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/72224371938.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28e407cb7---sutav.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zowosulalajabisimolazopuz.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b0ec1e79691970f85e8d15dfe0a80cbc/ruwefapudima.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098e70f1bd5a---nuzofiwokejademesetukegin.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/gigitilufosukesod.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/17959825657.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/remod.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/64587606916.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cee0e5b7a36---xezazowuleterejudorudu.pdfIn PDF document text
    • https://topupdana.com/contents//files/1988798130.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/wonudisem.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0bc9d51b19be3c6a99bd9d30b43a1b3b/wemetonegawuxejup.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210818235043.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/373c388512424501f06ed3d118304afe/97871416900.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/wesopunutu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/64871277768.pdfIn PDF document text
    • https://p87.hu/files/60260537619.pdfIn PDF document text
    • https://cdnbooks.fisrtmagazine.biz/zonex/1771644761In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+obesity+code+cookbook+pdf+free+downloadPDF 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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 11112 bytes
SHA-256: cb68ce0904a46bc738322ddd9cf996159f797f695470bb067cc73aab838a7a79
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16688 bytes
SHA-256: 2a84fe1a474be4c6602ad99980a4f6049e2fe136840926ab970b77168538fbca

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