Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1da357df058eb4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 05:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f1e5b60f22b51d7c068360f99a5f452 SHA-1: 249addba4a6b193a068d95524691ee0246b08b54 SHA-256: ba1da357df058eb444531495139ea30ad92cef189f6dda9c0b4b22e402893293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=boot+animations+android PDF link annotation
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/nabuwa.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/vemukugorisobutadafiku.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/kisejududikotaximular.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dea536bcd---94759173276.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/puzugebovijotivamadafexi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/70541443923.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbf30287c---62992849210.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/zatum.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/97780603996.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/kawusukizitif.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/wejovisezoxinopimanaket.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/mewebitimijuboxekewi.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/74899204958.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/78411130070.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/14038328680.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/81567271436.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/meverigi.pdfIn PDF document text
    • http://clingac.com/d/files/pozuxikov.pdfIn PDF document text
    • http://cobmedia.hu/include/nomukikatevamubilorixix.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/95253583649.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/49d1c4b1dabff32a337e822c69b80f0d/legavumufexenenesos.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/bimomofepemajogofumupito.pdfIn PDF document text
    • http://thietkevang.com/upload/files/95939538856.pdfIn PDF document text
    • https://zzhqhi.com/d/files/28440508727.pdfIn PDF document text
    • http://katachizu.com/img/news/files/fesigigajatero.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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10284 bytes
SHA-256: d5cd88264ab088432159938ba293171233441656b06d6e1943b9f63553b2d936
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 19696 bytes
SHA-256: 2d3f157dd095708ef7ced97b8f204584e50b8d3e671177a14fcae6f22b9e10ef

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