Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a80da91eab828ec…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 19:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81fc819ea4b6fa00717cf572738f1332 SHA-1: 5623e6e4cf7d0de9c344aafcc3bfbb080859f396 SHA-256: 7a80da91eab828ecb31d2f78ab40e746b16f177beafdf071ce1c2cd468ae8ab5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting, with one URL specifically referencing a PDF file. Crucially, it includes a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, strongly suggesting an attempt to trick the user into executing a malicious command or script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://goodlife88.com/uploads/files/42364091333.pdf In PDF document text
    • https://rajnnuhiddje.se/userfiles/file/kugipa.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/93080214155.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/sinijogupixisexoko.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezosagosaxolifuju.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xekakotez.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/teriregevemamejuji.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kobavuwigiv.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1ae21cc31---vukakiwijadoferiwewa.pdfIn PDF document text
    • http://boki.hu/editor_up/15397289444.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131f35d0b46d---18524348728.pdfIn PDF document text
    • http://fruitvita.com/files/files/luxufadamadawojiregezu.pdfIn PDF document text
    • https://armenia4d.com/contents/files/7758978828.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0e4864a9c346cb6ca49856937b310a87/ganozadujizoxudiw.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/zonagot.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/3679569619.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/67491661244.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/musorubafokupubifabasuf.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9e07c019---bololatedavilixo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267012831b---4450949230.pdfIn PDF document text
    • https://emenu.hu/editor_up/tatilujamatepoweju.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/16788878679.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/66017593222.pdfIn PDF document text
    • http://cityfate.com/files/files/xuvaruwuputod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+paper+downloadPDF 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_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 19264 bytes
SHA-256: de8d8052ae869cb934d3b83ba9928065f1c72d9431db7bb014c954e2342c122a
font_02_sfnt_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 10524 bytes
SHA-256: 11ab81c8fe31ec38c05e9f62853caadf42b83107fb1dd8b17166673c0bf3d28b

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