Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c0cebc4a1c533f…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 03:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d4e41a9ecc9980481f513c5e667caa3 SHA-1: 5ed6696f480fc8b2f7e6bcaa16b36f0c7fe99039 SHA-256: f3c0cebc4a1c533f220c2cd9e85b22334426a36b4c916cceffc8835b49b0f316
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure. No scripts were extracted, but the structure and URLs are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=euler+maclaurin+formula+pdf PDF link annotation
    • http://epmresearch.org/userfiles/files/mujalajaxan.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/44495895829.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f94b88909---95391215545.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f82145d4a7---sasomozetokifixikudegaze.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/67845621742.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0ae31c3a---dezogazo.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/rexefigudesusipenud.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/weriwivemubi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/91136255281.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/rutolanamewu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/99371222223.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wivufomivinilazesotokekuw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9b973ba9---25587460958.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/7832363425.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/3898883544.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/euevhpsvug4pnnumapm8mf1hr3/bilezolanigu.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/nakiwobawupuvaxeza.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/sariwepurajudorodewuti.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/dopigefaf.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1d128e9a9f0b0b12ecc16058fbf7dda2/vijupojiwapaku.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/93170641594.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d4245ebb---dudubesadufedam.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/mexix.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2b254247510e81b0b34de4c0c91a63b2/39815942087.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/77364883851.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/lonorexafofufer.pdfIn PDF document text
    • 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_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 21648 bytes
SHA-256: feb53334a70330d8a80716259e21837894849389272d0749fcb254014779d4c1
font_02_sfnt_off00014707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14707 10600 bytes
SHA-256: 694987d56a123d73265841017eaa436e38c1c5c666cfd777bdd07bf9bcb61fef

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