Malicious PDF — malware analysis report

Static analysis result for SHA-256 308a09b5f8e322d0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 18:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd5a05bb019170415a9414e196d3927e SHA-1: e3ee092bce93a34ae13521ae20f9e6b4b68de2d1 SHA-256: 308a09b5f8e322d02b6918b90f532b73c1a24d2d004e10d8631e7d7b0fa41e81
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to malicious websites, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cottoneauto.it/userfiles/files/kapixuzidulasupuwewiraf.pdf In PDF document text
    • https://laptopserwis.com/app/webroot/media/files/80442077772.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/71172126058.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/wepuwikivuzus.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145cddf30cc0---46030541268.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/96527244518.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/98511142065.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/miwagakevufewesikoned.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/26235879332.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/99625795344.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144fcd49bb8c---74946729890.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/vimuzuxesavijaforetilaru.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51ecf3b60---watore.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dilakor.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/logaxusozisan.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/legake.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/71823408013.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/93074449268.pdfIn PDF document text
    • http://mauspro.net/upload/files/losuboxeto.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/18834687308.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/79234204640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+happens+when+you+unblock+a+number+on+androidPDF 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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 18668 bytes
SHA-256: 86bfe43ae64d171c20cdb3013a49a47d9a2b92aa37c111a3cba0241e63143478
font_01_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 11304 bytes
SHA-256: 1563319dc85f33f69a4c26e70cb2721b4439b57efbdd397f832a7409c330ee5c