Malicious PDF — malware analysis report

Static analysis result for SHA-256 6796353f91f4ae94…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 13:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d817f20fd172e33f0d5d700e9d0e2212 SHA-1: 1eb7113f70fa88ec4a2834a39fcc44f85792a4dc SHA-256: 6796353f91f4ae94754bfd60173ae5b2cb0ca93716a8b63840374db37630b9fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=blade+of+conquest+mod+apk PDF link annotation
    • http://oryginalnedekoracje.pl/userfiles/file/83485403477.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/89742931654.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a41e36a6---29168164289.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/83790213122.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/94651450596.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/51044751892.pdfIn PDF document text
    • https://onlinendttraining.com/files/72453381058.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kimikexexudoxogezosano.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135f783dd700---mujubesal.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/98923583917.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/wunuvebosumig.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/87819278693.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/72652246017.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/nupozez.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/selagosurenebabivejob.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/dosamamu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e245b1d1b869d924c5030b167e3db5df/nifip.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/87736967678.pdfIn PDF document text
    • http://philipsphotographystudio.com/3057945996.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136475cd7dda---63970526757.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/xugusebugefuvajax.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/xekodanerivevebojurinonog.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/zovaviberejaxawagede.pdfIn PDF document text
    • http://mfcpavpos.ru/file/69869341058.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 16328 bytes
SHA-256: 51b7299cf5c818502465d8a3968d035503e332f54dac8365f31700c9d30470ae
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10980 bytes
SHA-256: 5120bf5e6b11f25308109731f9199cade4639b19b3867c4ec54c5a1019408605
font_03_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 21956 bytes
SHA-256: a465ad4e85e43f4144a33d9386c51f4339588657958d79d8c054ee891ef8f3c1

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