Malicious PDF — malware analysis report

Static analysis result for SHA-256 f132bde5b3c76ea3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 01:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c52a6cacd57c4220559a886fde864d30 SHA-1: c0120547b36ceab57c6114621c69c1d343d4cef2 SHA-256: f132bde5b3c76ea3c525d7558bd39b352435778a70bc48eab48dead32c362974
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to websites hosted on compromised CMS platforms, including WordPress. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://egca.fr/userfiles/file/xuzikunodipom.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb0e444e9---jakemafunuvowi.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/xojaresub.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a16055e4---depalovenekibepini.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a61c4b030d0e9dd9355811feb9ce1bc8/levefutevesubiwon.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/rutusopijexokipedosedi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce21581e78---feganixifa.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/70702179777.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e01610ad62a5a0ba73e4e6b420f9727d/gogopezoretelizexoxaxexe.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/i6t8ou0n5drkk64ascbgjofdru/xeboxas.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8ac10c3035988ed22ccea6e83fab0cb0/lerobawodelulogonenexub.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/33380697522.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c24522be15dcb7758ced974e8a636be3/potaribuvebidekuta.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/11143707818.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9ae70fb09---kejigadav.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/80648480905.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60b9d605ee01c.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/15291459204.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/sazewebiwixule.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/jalunusunafuxegakeguleduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=masyarakat+dan+kelompok+sosial+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_off0000c8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 10860 bytes
SHA-256: d5f117f440c1cc97fb4d9b8b8843353e206e00f6bd9003717681e59ab55418a7
font_01_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 16172 bytes
SHA-256: 85bcaf8180743f477055106f8cb18c93eff60b44ff889b8e914a942433f123c3
font_02_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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