Malicious PDF — malware analysis report

Static analysis result for SHA-256 284266f8cbf1808f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 06:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 613e2e9e14a30b09f5ef4a420f9acc65 SHA-1: 5e9d6808e4cc8499803a7020962cc5a99b2fc4f2 SHA-256: 284266f8cbf1808fc817903f8f3b400a3acba51b9b7b809a780230cc636b0448
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting domains. These links likely serve to distribute further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://21cedu.com/pds/userfiles/files/45085607040.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc71fba7b8---77076009958.pdfIn PDF document text
    • https://anfauglir.com/images/file/73601880206.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e47987c037---55181177659.pdfIn PDF document text
    • http://compsult.net/userfiles/file/limemulupolufobelif.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125692b2801d---4868617665.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/gilejokezomodaregipa.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/85026753496.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/95076803706.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6768228ed0eebec7c667098f201fe778/basogiwixakuwotitekiwewa.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/54750024757.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/54808290143.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/95595541793.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/6584406334.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4f4cbd84---13586005702.pdfIn PDF document text
    • http://cartopack.com/Images/file/16723267664.pdfIn PDF document text
    • http://axwelindia.com/uploads/90828222172.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/vuwavovuvopil.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4a9dba95---62253400094.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/busumapojevukofidozono.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/nozived.pdfIn PDF document text
    • https://digireg.se/upload/41315190127.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/64825530008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=instron+universal+testing+machine+manualPDF 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_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10796 bytes
SHA-256: 356cf26d64b29e942dcdfceabc0248074dffbd74ce77737646935b38726dfbb1
font_02_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 17524 bytes
SHA-256: af1bf76cea1d9f27faa2344206671006d595ac93ba406f57b62cf8b56089b2e9

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