Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c17271d7196a5c8…

MALICIOUS

PDF

99.9 KB Created: 2021-08-21 11:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea8aa2587c0278c90997a74bc3418618 SHA-1: 0761e1f555390d1f6f3a49f1dfa1accf9b65c42c SHA-256: 0c17271d7196a5c8279e5b5c34aac71bdd9d6483157f1a3bf36bb8f4eac4982d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://imssp.by/data/images/fxeditor/file/xagug.pdf In PDF document text
    • http://thaisomboonautopart.com/userfiles/files/fobukuwerebetib.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd3689fa5---lulezaxal.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69328003445.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/77694960828.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210622_174758.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/83227722728.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xinoluwelosu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v9ns5j0ckkg9snb51763veqpg0/75861702241.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/daxubulisuxug.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/15075225345.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/boxutujoweluzawefileb.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/pekafejepij.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/noxub.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4142b62e9bb156155e5f254e162e0542/fuboj.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3b4918bc4a7cf7b62820111dc364561a/81793094616.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161048cd1cbb05---vukude.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vewafadibejinutaxabeveja.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/wovalirusenupolab.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/00a14b484a28b8e77594568cc5bb2afc/10464223979.pdfIn PDF document text
    • http://ux-school.ru/files/files/4968040540.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/dirogumufuzewalazoxeki.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072417504931.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/74531855290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=los+articulos+definidos+e+indefinidos+worksheetPDF 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_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 10808 bytes
SHA-256: 9502ab8f422bb3be89d413d5bd418d2ac65f4752cddc81fb46b7c0aecb5e7d66
font_01_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 19580 bytes
SHA-256: 931dd33ca0f226bde23099c5c771bb37dd0a09e3b76813246c3cb9cf1ceb378f
font_02_sfnt_off000166be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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