Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d8f1a07d66f08…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 07:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81c8ffc3d744df95a6feef24c8fd7679 SHA-1: fdc6f18e2e664e0837e88776259b5607c8ac373b SHA-256: fb5d8f1a07d66f08a02c8392c6abb498d4834884b2d01e42c7ef0919fb799725
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features numerous links to external URLs, many of which point to compromised CMS uploads or are part of a link farm, suggesting an attempt to distribute malware or redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://walosports.cl/userfiles/file/rexukuvebedixu.pdf In PDF document text
    • http://philboyd.com/19456813224.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/lafotuladotowawojukeg.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0190cacb8cd2ed97b1a520d5126f437a/jasatalelafonamuse.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/214d2c49d48b5c9ff96299acdad63baf/86591971845.pdfIn PDF document text
    • https://atlantidegattico.it/file/midavuriz.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/pananekegivofilovaf.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/85196593057.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/dukofulumoxid.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vepisetekazorowil.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a62cq6bdc19qr34a93phpqm36r/35866679105.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143912be2bd2---jejovan.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/2550156574.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/rikije.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/69810191544.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/53420852691.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dujefidowij.pdfIn PDF document text
    • https://clinicscrm.com/img/files/duwagarumij.pdfIn PDF document text
    • https://domilot.com/uploader/files/82599667121.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/fuwixofekasuxuxisej.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161382a7406484---foduzujuzipu.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109152234212429263ph2iw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614087789769f---duleketibowigumenir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=xvideoservicethief+2.4+1+free+download+for+android+studio+apk+video+oPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/19874232750.pdfIn PDF document text
    • 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_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 17456 bytes
SHA-256: eb43eec5054316a63de9be4fe1159ad5286df009c6897ddf20fcf2623ec71f63
font_02_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 11384 bytes
SHA-256: bd4edffc6fccf621a1d07b14324df062fe1f373fafca728bc668d89e9aa014dc

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