Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a965daa111a68c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f394748da57dc15acb4c0a35c161fd4 SHA-1: fc3e0f6b9f94bac0fb5ba17c7c63f36ca0833583 SHA-256: a8a965daa111a68c76e3d353b67d8c8f005ac1550fdc0fdf70246464246b5be1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://srmtteaparty.com/uploads/files/202109021806319712.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4s9gu8kitf0n50n6pq0h63bs63/fudirotabakiwonebi.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vukakuboj.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/menajugezezedibevitozowip.pdfIn PDF document text
    • https://ienter.bg/files/65143650428.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xowikinixenexuxik.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/52324655342.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f8544132cd2f72ea3dfc82c35f21468a/bazudegafizidamotox.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/kokazuselomexeg.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/32525364021.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/99834548431.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/poderoxarav.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/7659518783.pdfIn PDF document text
    • http://hzqzg.com/d/files/44564817038.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/dunafuw.pdfIn PDF document text
    • https://taperagi.com/contents/files/63704333533.pdfIn PDF document text
    • https://jensbrode.de/files/file/5275655513.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/favemufivuxugediji.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/29907212383.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/3498747821.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631197821.pdfIn PDF document text
    • https://tsolisp.com/files/file/marix.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tifigidobekunofon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492527ba43---27429894396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fun+family+phone+gamesPDF 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_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 10796 bytes
SHA-256: dca11c464a386b8c1b54f9bb7e411305fc9af04c7c43d9c1634670dfadebe5d9
font_02_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 15700 bytes
SHA-256: 26464cc153c63dc49e0ed8fc000171089120cff23c6d9f77bac6dc25fc1d1a14