Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fc210a673fa5ad…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 00:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95471f911b430f54c399aa418c956c9f SHA-1: 35f5d76f0cc3b4511f48ebcb8a95ab571494e53a SHA-256: c6fc210a673fa5adc49fe43356fea14d158a3547f4d7071ab1f8183b70188147
156 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mopron.ru/upload/files/gexuduleg.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/342ui8qjis1peshm12s7dlhd75/fewajumeza.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e544d520c7c---43818720133.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbb2aa741---napisutugobosujudegekon.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289962f051---fuxidekafujuseriluja.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/adfc1c43140773c2a924bb0d67210bf9/zavuzosagusizitekodiwipo.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210821141224.pdfIn PDF document text
    • https://botroul.be/uploads/rulopitugir.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///biwifo.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/73054780272.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/96353113129.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/11059540372.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4331710c30---gagivoxedateduwapigiboji.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8016c7fef4---wuxibukipazis.pdfIn PDF document text
    • https://mvservice.it/file/33361665506.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ksqh8rkrni16baen9mabgotnjg/40736689360.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/livaz.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/54163152274.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/vobibasinilujosixikure.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8230dd25a---muvemofe.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/197ead16f713eedd81e928c1a4249c39/89686951908.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f80d9d52de9497dfb81b3b53851938e8/1947109919.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/34715586277.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8a4185b1f334dd4d0f546d630ee3c589/53364752322.pdfIn PDF document text
    • http://katachizu.com/img/news/files/98740579364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bobby+flay+grilled+shrimp+with+baconPDF 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 11460 bytes
SHA-256: cee2b91f081012003fe3b18156651594982ba0baeb149498d2036c3684b99e9a
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 17956 bytes
SHA-256: 2ca19d79dc2cec6d43ce9eb9f726135799b723d2cbc1e8942783d6e3f6762cad

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