Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc620e1b45f31053…

MALICIOUS

PDF

98.4 KB Created: 2021-09-19 00:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 416efbb750ee02a5542e096e94377ef3 SHA-1: 9feca9b6aab0ac5af2b3f8abc0db048a67b329c6 SHA-256: fc620e1b45f31053275e7ac6d3a20a82daa1b55c399ba1652c2af6b845151636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress upload storage. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were extracted, the overall structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf8uhi56rph6jk9m9t2ecqc6h5/joninaludofukumupajemudax.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/91bca6f17e131842644bc25eae50eaa8/xokanuja.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mivedolijepipagigupanuji.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/duxowilepibufirinitus.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/lapugesilexuw.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af2e6fcc3---gutuka.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/32170803397.pdfIn PDF document text
    • http://one9five.com/userfiles/files/tebivirelawowita.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/nepuzenodatep.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/59615886396.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/paputajoxodekunaluduludix.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/jezogipebivexi.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/84676030852.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/vidovudevibi.pdfIn PDF document text
    • https://loyd.rs/images/file/55529019350.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/36777649479.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/magodonisu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/59e8a01f0c850c220790ceaec1e17be3/tevazitinesakapajimaremub.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///75619946256.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/xabamitusatovoliluwo.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/taxomizul.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/31586345760.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/8975241805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=react+native+jdk+versionPDF 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_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 19088 bytes
SHA-256: f89ecadc455c9c5090cc9b601ab1afae9cba1304c4e080ecebb0a69d27eba93c
font_02_sfnt_off00016368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16368 10652 bytes
SHA-256: 90de95686121c93760a855ac35490574f66c401ee9755e04654e5a1b038bada9