Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaccb7744d04e72…

MALICIOUS

PDF

90.2 KB Created: 2021-09-13 15:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d803d7ecb288937bf414fd7120ad8f9 SHA-1: da39681b4249703306ee676a0cda336a2e0ee2c3 SHA-256: cfaccb7744d04e72fe302837f43de93a7a89baa94ae6b33a8ebd3efef79d99eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to other PDFs hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content. The presence of multiple unknown URLs suggests a broad phishing or redirection campaign.

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 http://climacom.eu/userfiles/files/86781816579.pdf In PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/40715625623.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/gimivego.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/89245415409.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/69164300472.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db7b0219---lunok.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/72331675705.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/10732478562.pdfIn PDF document text
    • http://ibb-online.ru/f/file/31095438098.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/78390303279.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/24212871930.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/xineburuzukepo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0ed9b5438cf04999ffea701037a340a6/saludulopuxelefelekejowu.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/83660798942.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427012bda5---1601796908.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/sejebiwavojaxemobumonunu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/jagofu.pdfIn PDF document text
    • http://www.bash.cl/media/file/84109099324.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/48431644127.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/10259504146.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/62250554732.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/72582189918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=maguva+movie+movierulzPDF 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_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 17228 bytes
SHA-256: 6da13fae8d710aa8f96aa26ce590bf3ecac82b3cc08d6e338ac09e96d0a6c93d
font_01_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14440 10300 bytes
SHA-256: 0d53940ea9f6a0ddb0cdcea1b8792ca57f1d52f14aab839a5b3e7c2d49a23454