Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ca5cbeaa6cc3d1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98f511cc78d4f2d021fdd2b894e3733a SHA-1: efc0c21e84ff84f30a36e2815bb2c74609e557ee SHA-256: e3ca5cbeaa6cc3d1da23a69bdaf50ee3428e87284ef50fd58513cdb2084245e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=lidar+scanner+android+app PDF link annotation
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/tfrl165pp7q46vi9rvmiqs035a/76749014444.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/95612834440.pdfIn PDF document text
    • https://funke.be/data/file/zibuw.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b457d39eb9---mejonudaxavexubepurux.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/98419249463.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/tulemozobovulosaw.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/lizin.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/13132761371.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/davagazezepeb.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/lefejogoxero.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/bimasejuwojalu.pdfIn PDF document text
    • https://laser123.com/geektic/files/90372662818.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/firiv.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613099e216cf2---neluwepu.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vafimotamowopobipamam.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/21451980848.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c93f8d8ca---rebiwuvijisedufan.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/majifubukibelarewiliduguj.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091910494328.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/46213996095.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/genizezedotanimusatowos.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/82417364725.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/68543913505.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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 17428 bytes
SHA-256: 05bac80fd8a4101ff858e1439b54232613f3c898f202536f38d2ce73bd9fbf28
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 10320 bytes
SHA-256: 118924c70ad771b4b1c28af7934c55c8b65d423d96c9881928008a6b87bdbc36
font_02_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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