Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bf8a2b00a26302…

MALICIOUS

PDF

85.6 KB Created: 2021-08-17 07:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8bfc62aca7d7adc8bcc0df102e2f9d0 SHA-1: 86c1b7cd384ac9899b8da52bbfe4a6a79e7566a6 SHA-256: 41bf8a2b00a26302936bcff32ba55aaf5f105fa64cd6a19cd11d69b51b4ed322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://langeline.com/ckeditor/upload/files/xatalopa.pdf In PDF document text
    • http://cristal-in.fr/userfiles/file/84363822182.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d37310c0292dd9b3ed40da7037200962/17682726858.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/zejazi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d47e5fd7d0d23a6eb988f0a67a93d1df/wavarogagober.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/35886992738.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/86dc7bab69170d5c24492776d92614a7/40182791228.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/33773932260.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/76869279988.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/tutexoribugawe.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884ee2221e8---15419730135.pdfIn PDF document text
    • http://chinalabware.ru/d/files/83870483923.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/45500879023.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/99230057394.pdfIn PDF document text
    • https://windsbs.biz/files/file/zuloponexum.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zanebekoli.pdfIn PDF document text
    • https://priscar.com/documents/files/83121473057.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/pesafupo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/biduxa.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/21297928582.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/komagitutodimitidox.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e6ba5c1a---83921125835.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504142334870.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/20254186038.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/47529033219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=como+fazer+sum%C3%A1rio+no+word+do+celularPDF 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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10996 bytes
SHA-256: 4902d717a9b01206c8cc8456f3b170bf43d8e3acbeba4c2fb30c0d9f8da30afe
font_01_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 19276 bytes
SHA-256: 2697c37b58085aec49576eaaf316880637953ad1c935f60a2d82cc010be41e30