Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e66fe4738433ffe…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 20:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25c33d14bf8c62062b9967d70dcc1de5 SHA-1: 8c5a56257e4d49d860f2bce54f8d05212333ff2a SHA-256: 7e66fe4738433ffe797bc97906a938f4f8d452c08f90bd83b39531da3c5d8e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=original+bliss+watch+online PDF link annotation
    • https://www.studioline.ie/ckfinder/userfiles/files/zuzetixasalulir.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff21a7d685---64793053810.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/kesexisodowimatetuma.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/94737ceffff15349fb9bcb600d6050b3/nawidasopuperajodel.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/nexukunatuxevajogaxo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350470c44ca---ledonowe.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/77097320024.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gisuxuboladoxukerelelane.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/74261363475.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35292347323.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/76945092939.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/xuvematu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a7bb0f74b04d332a63c6d5d1f8c7703d/89859738786.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/24370014885.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qk4hidvsr01a4huqa97m30gfa5/7306476040.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/90816830721.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/23304683017.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/xejipinedusosijabi.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/17205670134.pdfIn PDF document text
    • http://builderall.info/userfiles/file/34651650517.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/pakogurubalelex.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/66800774168.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/misetuwikikesisurikamu.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xagijorisipunasej.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_off0000b0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 10760 bytes
SHA-256: 15ba30b8100e77ac4e2c02048e8700091a770c188a579548854c8369917ad151
font_01_sfnt_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 15016 bytes
SHA-256: afd4efee62aa5dbfb926957a213df04973ca52cc60131b11d70d7429a7f83413
font_02_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1