Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f75620ac76293c…

MALICIOUS

PDF

92.5 KB Created: 2021-06-27 23:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dc9b83c8cf9e9b11262918b89e7f136d SHA-1: ec51e4be37a981f6e1d220a950212ca164f66e9f SHA-256: b5f75620ac76293c28e9da07a25b0051f49d80f6f4451ad6c79585813907f71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae87210e5---gupajajabalifemojip.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6fe3de129fee39233483a0d901a00f31/96213762038.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160885bb22dea8---tejipogipadavonem.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117750a037---17874019520.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/17820047879.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/tekifeme.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/70d9bb08bb620b37e4eabaf1a38688fd/xofuzufunomo.pdfIn PDF document text
    • https://werbemittelag.chupload/file/99840993206.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/a1rcapepjp7qr56nardt1pdbae/25804679163.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/4815561174.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/83309561576.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/xiforefifalozere.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/94829813063.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9465e5351---59420696797.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b00a84b5---34462727896.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/67236964330.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8b17e820---votamuwakapiz.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/midog.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516164234.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/70a18bcdab8ba98dfe4f1fec3c1e7fd3/ramomawepokafumaf.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d44b0fa602a8b25fcb85ebe8344f3ab/kenazefib.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/37609076414.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5da9e267091ec6fb3b41d1e7d47f9b83/xeguwizipumupitixisux.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/87935831849.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/53735826051.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7nida6nucjpc8m5k206gg9lrpo/80338066726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wuthering+heights+characters+pdfPDF 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_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 10824 bytes
SHA-256: 2051c7bdde5d6bd41abb42c168a09a5038cb109545a3a773f87cbbc1a3b3ae64
font_02_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 16452 bytes
SHA-256: 802b7a9c62ddc3690b319129efe1a5cb83b73ca426ed84b9b61933d67d0ad2de