Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d9d6cbe98fdfce…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 04:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14cd6f0479a749794241399dea68a9d2 SHA-1: ccf2c0c77d00e487662048e0fdba420f59e16b86 SHA-256: 45d9d6cbe98fdfceab25adb23bdecc31c3b952cc0aaea63d6b49518dd892d188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL analysis point towards an attempt to exploit users by directing them to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://scalper.ir/data/files/file/93951071934.pdf In PDF document text
    • http://sh-songshi.com/admin/upimg/file///fefewonitisoxifirozavumu.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/lezupubazumozup.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/romuj.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/407d4b028a72c9de489cc3a0369136d5/16398436109.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f836cad003a---vuzuzogefumefurekix.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/998d5eae9d2b2fb755649c20308ffebb/nigem.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609610e4e6ed5---belegu.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/75510680639.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/nogivodo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b1bcd19e---28715815077.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rebevorezozukemefiv.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/42197819599.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///21884996821.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f69776a60---36317705787.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3641697c---fezibeniderelexu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0c3982b6---28496998706.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/jowefilalumeso.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/seboxoxoruxutuvo.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/61747129650.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/auhcjkiaumhr6ig7mlbifpc74i/50253464230.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071673b534c3---bunoluxozajarivu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2gsb07se31bdefdu1l1cuot9b4/xifaxirefuzekemewegasuzot.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/76515084005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=descargar+diccionario+ingles+espa%C3%B1ol+pdf+oxfordPDF 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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 18100 bytes
SHA-256: b842a74e9ea8b5c9c149631545953be29297dd4254dfe4d90249cd43b0d2d37c
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 11008 bytes
SHA-256: fef220d5214389d1fa2ab403cb2c65b847366f28484b4e7d18ff19b7dcd6c88b

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